Without any disrespect, can you explain how you plan to differentiate yourself from astrid (www.astrid.com). Your app certainly rocks but I couldn't find any key differences.
On the surface Orchestra looks like any number of to-do lists, but beneath it's actually a real-time messaging system. Think group chat for getting things done, with sync that just works without ever having to "pull-to-refresh" (so 2009). Also, welcome to Hacker News!
I'm a long time lurker but registered so that I could ask you because I loved orchestra but I need the android app to be useful for me (ios+android you see)