[d0m]

I guess any entrepreneur already thought about building that application once in their life. I myself thought of it a lot of time.. but always dismissed it thinking that it wasn't a monetizable business and only a fun hack project over a weedkend.

However, these guys seemed to have proved me wrong as they're in YC while my "serious business ideas" were rejected. Or, maybe YC decided to invest mainly for the team (Both founder were "Product manager at Google") ? Still, I'll follow their path and I hope they'll be successful :)

[eneveu]

Same here. They seem to solve a problem I personally have.

Currently, I use emails (sent from my phone) to "remember" what I owe people and what they owe me, but it's kind of annoying. I also thought about building an Android app, but I think I'll just use this instead.

[rfrey]

A pattern I've observed (for a few guys who've gone through YC) is that they pitch a larger vision, but the process and/or Graham team leads them to implement only a stepping stone to that vision, at least as a first release.