Short answer is YES. My app Noodles (see: makeramen.com) was just another todo list on the Android market, and somehow -to my surprise- gained some very solid

Short answer is YES. My app Noodles (see: makeramen.com) was just another todo list on the Android market, and somehow -to my surprise- gained some very solid traction. The amazing thing about the productivity software space is that everyone wants their app to do something different. It's also much more of a designer's space. I've seen countless apps that have all the "features," but the actual interface and interaction is so awkward you end up spending more time fighting the system than using it. As many people have noted about 37signals, people realize the benefits of software like this almost immediately, and will easily spend money on it. Contrast that with other social sites where people are just not culturally incline to pay for services that connect you with friends. But you start talking about productivity, and helping people work faster, better, and more efficiently, and they see benefits immediately, which means they'll reach for their wallets immediately as well.