Each day, Inc.'s reporters scour the Web for the most important and interesting news to entrepreneurs. Here's what we found today.

Work less. That's today's advice from Think Vitamin, a blog for designers and developers. In a blog post, Ryan Carson of the web conference company Carsonified, writes that a four-day work week makes employees more efficient at what they do, because they have less time to do it. "Humans are in general efficient beings. However, we have an annoying habit of making our work fill our time," Carson writes. "When we were students we would always finish our essays with an hour to spare before the deadline...it's the same now that we are in the workplace." Click here for tips on instituting the four-day work week.

Where are the immigrant entrepreneurs? And why is immigrant entrepreneurship booming in countries that compete with us? TechCrunch explores U.S. immigration policy, and how American political leaders "mistakenly believe that skilled immigrants take American jobs away." Tech entrepreneur Vivek Wadhwa writes, "The opposite is true: skilled immigrants start the majority of Silicon Valley start-ups; they create jobs." The policy issue? More than a million doctors, researchers, and engineers are on temporary work-visas, meaning they can't start businesses in the United States. He gives a half-dozen examples of entrepreneurs driven out by visa problems, including that of Wharton graduate Kunal Bahl, who returned home to India when he couldn't secure a visa. Last year, he started SnapDeal, daily deal site, which has now created hundreds of jobs for the Indian economy.

Meet the green stars. Today's Fortune highlights the eight leaders who are leading the business world to a more Earth-friendly future. Scott Vitters at Coca-Cola started an initiative to make Coke bottles out of plants and is partnering with Heinz to produce bottles made from 30 percent sugar cane. And on the Southwest Airlines Green Team, staff is stripping down the cabins and adding lighter-weight carpeting, life vests and seat covers to make the planes less heavy, and therefore, more fuel efficient. From FedEx's electric vehicles to Proctor & Gamble's high-performance coldwater detergent, find the rest of Fortune's list here.

Tweets from a revolution, now in book form. Some of the first reports of the Egyptian revolution came from Twitter. Now, only a couple of months later, readers can recount all of the "Best Of" tweets in Tweets From Tahrir, a narrative of the revolution told in snippets of 140 characters or less. According to the The New York Times, the book details each day of the uprising up until Mubarak resigned, which brings up an interesting question: do the book's publishers have the right to use Twitter for their own profit? "I think Twitter is going to be supportive of the book," says Colin Robinson, whose company OR Books publishes Tweets from Tahrir. "I think they should be proud of the fact that their technology helped these young people."

RIM loses marketing chief weeks before tablet launch. Weeks before the release of the company's first tablet design, telecommunication device company Research in Motion, best known for developing the BlackBerry smartphone, will lose its chief marketing officer. According to The Wall Street Journal, marketing chief Keith Pardy is leaving the Waterloo, Ontario-based company "for personal reasons." Pardy apparently told the company a month ago about his plans to depart. This announcement comes at a bad time for RIM, as the company prepares to release its BlackBerry Playbook tablet within the next two months, hoping to compete with popular tablets such as Apple's iPad 2 and Motorola's Xoom. While Pardy has agreed to continue assisting RIM over the next six months, the company has not yet officially announced a new head of marketing.

Is your business credit-worthy? Want a solid piece of advice with regards to your small business? Maintain a good credit score at all costs. According to the Los Angeles Times, higher scores can lead to better payment terms from vendors, and may also drive business your way. As it turns out, potential customers occasionally check the credit ratings of new firms prior to placing orders with them. William Davey, a business consultant specializing in access to capital at the nonprofit Small Business Development Center in Santa Ana, CA, says that the first step to building credit is to obtain a small-business credit card. It's crucial to establish good credit before actually borrowing money from banks. And when it comes time to apply for a loan, read the fine print in loan guarantee documents and be prepared to negotiate terms.

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