30 Under 30: America's Coolest Young Entrepreneurs

Age: 27 (Carter), 27 (Branson)
Location: Bethesda, Maryland
2008 Revenue: $2.5 million
Employees: 3 full-time domestically, 1,500-2,000 stitchers in Vietnam
Founded: 2004
Website: www.smathersandbranson.com
Facebook: www.facebook.com/pages/Smathers-and-Branson/99058654730
Twitter: www.twitter.com/SandBBelts

What they do: Manufacture and sell preppy needlepoint belts, key fobs, and wallets, among other products, with the help of nearly 2,000 stitchers in Vietnam

(pictured: Carter left, Branson right)

Age: 13
Location: Dallas
2008 Revenue: $1.6 million
Employees: 25
Founded: 2006
Website: www.m3girldesigns.com
Facebook: www.facebook.com/pages/Snap-Caps-by-m3-girl-designs/91805695911
Twitter: www.twitter.com/m3girldesigns

What she does: Designs and sells thousands of Snap Caps -- colorful bottle caps that can be worn as charms on necklaces, bracelets, and hairpins

Age: 23
Location: New York
2008 Revenue: Undisclosed
Employees: 3 full-time, 2 part-time
Founded: 2005
Website: www.hypem.com
Facebook: www.facebook.com/hypem
Twitter: www.twitter.com/hypem

What he does: Runs a popular music website that aggregates the best of 1,500 blogs, allows users to buy songs and concert tickets, and combines social networking tools that allows them to share their favorites

Age: 24
Location: Oceanside, California
2008 Revenue: n/a
2009 Projected Revenue: $400,000
Employees: 2
Founded: 2008
Website: www.barleyandbirch.com
Twitter: www.twitter.com/barleyandbirch

What she does: Makes children's clothing from 100 percent certified organic cotton and water-based inks, which have become popular among celebrity moms like Jessica Alba and Cheryl Crow

Age: 28
Locations: Honolulu, Hawaii and Hong Kong, China
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 6
Founded: 2007
Website: www.humdingerwind.com

What he does: Makes a small device that can capture energy on bridges, skyscrapers, and other urban areas where traditional wind turbines will not fit

Age: 28
Location: Grand Rapids, Michigan
2008 Revenue: $580,000
2009 Projected Revenue: $1.8 million
Employees: 8
Founded: 2008
Website: www.heyjosh.com
Facebook: www.facebook.com/heyjoshfan
Twitter: www.twitter.com/joshshipp

What he does: Provides practical advice for teenagers through a popular website, speaking engagements, workbooks, and DVDs

Age: 29
Location: Calverton, New York
2008 Revenue: $17.6 million
2009 Projected Revenue: $34 million
Employees: 25
Founded: 2000
Website: www.electronicpayments.com

What he does: Processes credit-card transactions for merchants, including Subway restaurants and Toyota car dealerships

Age: 24
Location: New York, San Francisco, London
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 12
Founded: 2005
Website: www.mashable.com
Facebook: www.facebook.com/mashable
Twitter: www.twitter.com/mashable

What he does: Runs a news and advice blog about social media, which draws 7.8 million unique visitors and has become one of the Web's most popular

Ages: 27 (Jodie), 24 (Danielle)
Location: New York
2008 Revenue: $400,000
2009 Projected Revenue: $1 million
Employees: 4
Founded: 2008
Website: www.dannijo.com
Facebook: www.facebook.com/pages/DanniJo-Jewels/19715933496
Twitter: www.twitter.com/dannijo

What they do: Design and market handmade jewelry that is sold in high-end stores and boutiques, including Bergdorf Goodman

(pictured: Jodie left, Danielle right)

Age: 24
Location: Washington, D.C.
2008 Revenue: n/a
2009 Projected Revenue: Undisclosed
Employees: 7
Founded: 2008
Website: www.thesummitseries.com

What he does: Organizes networking events for young entrepreneurs and other up-and-comers in locales like Miami and Aspen, Colorado

Ages: 24 (Young), 25 (Sar), and 25 (Harris)
Location: San Mateo, California
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 7
Founded: 2007
Website: www.apture.com
Facebook: www.facebook.com/apture
Twitter: www.twitter.com/apture

What they do: Provides a platform that allows bloggers and publishers like The Wall Street Journal to string multiple websites together in a single hyperlink, which makes it easier for users to browse different types of multimedia content on the same page

(pictured left to right: Sar, Harris, Young)

Ages: 25 (Newman), 25 (Avallon), 25 (Goscha)
Location: Cambridge, Massachusetts
2008 Revenue: n/a
2009 Projected Revenue: Undisclosed
Employees: 18
Founded: 2002
Website: www.ideapaint.com
Facebook: www.facebook.com/IdeaPaint
Twitter: www.twitter.com/ideapaint

What they do: Manufacture a paint that turns any smooth surface into a dry-erase board, which is used by the likes of MTV and the CIA

(pictured left to right: Newman, Goscha, Avallon)

Ages: 25 (Bauman), 26 (LaFave), 25 (Olson)
Location: San Francisco
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 2
Founded: 2008
Website: www.foodzie.com
Facebook: www.facebook.com/foodzie
Twitter: www.twitter.com/foodzie

What they do: Provides an online marketplace for artisanal and organic food producers, who peddle baked goods, cheeses, and other products to customers across the country

(pictured left to right: Bauman, Olson, LaFave)

Ages: 26 (Seibel), 26 (Kan), 26 (Shear), 24 (Vogt)
Location: San Francisco
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 24
Founded: 2006
Website: www.justin.tv
Facebook: www.facebook.com/pages/Justintv/15210066181
Twitter: www.twitter.com/justintv

What they do: Provide a platform for anyone to broadcast (and watch) live video online for free, drawing 31 million unique visitors a month

(pictured left to right: Shear, Seibel, Kan, Vogt)

Ages: 28 (Lerer), 29 (Rich)
Location: New York
2008 Revenue: Undisclosed
2009 Projected Revenue: Undisclosed
Employees: 42
Founded: 2005
Website: www.thrillist.com
Facebook: www.facebook.com/thrillist
Twitter: www.twitter.com/thrillist

What they do: Publish daily e-mail newsletters for "dudes," featuring tips about restaurant openings, bar specials, and the like

(pictured: Rich left, Lerer right)

Ages: 25 (Eric) and 24 (Susan)
Location: Pittsburgh
2008 Revenue: $3 million
2009 Projected Revenue: $15 million
Employees: 92
Founded: 2003
Website: www.modcloth.com
Facebook: www.facebook.com/ModCloth
Twitter: www.twitter.com/modcloth

What they do: Sell vintage and vintage-inspired clothing from more than 300 designers online

Age: 25
Location: Augusta, Georgia
2008 Revenue: $7.2 million combined ($5.76 million from Ascension)
2009 Projected Revenue: $8.4 million combined
Employees: 4
Founded: 2001 (Larkins), 2004 (Ascension)
Website: www.ascensionaircraft.com
Twitter: www.twitter.com/ascensionair

What he does: Sells and leases general aviation aircraft -- from four-seat piston-powered airplanes to medium-size corporate jets