I noticed that people rarely use the foursquare "to-do" section, so started working on a similar project a few weeks ago.

There are lots of interesting things you can do with the data once you get it.

You appear to be going more along the lines of a 43things/plancast. I'm not going for the exact same space, but I'm sure there is some overlap.

I'm not sure I get the name 8tysix. Is there a reference I'm missing?

Overall, I like your homepage design. But once I get into the app, there are lots of alignment issues and stuff that I'm not digging.

I suspect you just rushed this out to get some feedback, but I would have liked to see more of a polish on the beta.