I have a copy of AdWords for Dummies, which comes with a $25 AdWords Gift Certificate. If you want it, leave a comment below describing your favorite tech tool or Web service (Mint.com, Google Docs, Zoho, etc.) If you're a business owner, describe how you use it in your business. The contest is open until Monday, May 11 at 5 p.m. I'll use a random number generator to pick a winner. I'll email you the promo code for the gift certificate so you can use it right away, and mail you the book. (Or, if you only want the gift certificate, let me know and I'll pick a second winner for the book.)

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