10 of 10
BACKNEXT
Wooo Button
Wooo Button
Price: Free
Developer: Aaron Berk
What it does: For the many situations in which a man shouting "Woo!" is appropriate, there's this free app. Forty thousand people downloaded it in the first three days after it appeared.


More galleries
Last updated September 23 2008: 5:20 PM ET
7 cool new smartphones Once reserved for business executives, smartphones today are thinner, sleeker and available in colors like pink and aquamarine. More
What's everyone yelping about? Or is it digging? Or ninging? Zyng-ing? A rundown of some Web 2.0 startups getting a lot of buzz. More
Top 10 luxury rides For those who want the best of the best, here they are. Plus 20 more options to consider. More