Just a quick update.
The android market crash reports have already helped me find a bug in Todo Q.
Recent releases have also fixed a couple of bugs in address lookup and added features to control the custom icons and category assignment.
The only other thing on my mind right now is Froyo. Seems the Calendar provider changes are breaking applications everywhere. Time to go back to gdata. Ugh. (bug on google code)
Todo Q is only $1.99 on the android market. Give it a try today.
This bug comment says the provider URI was updated.
Content provider URI
Old (2.1 and before): content://calendar/
New (2.2): content://com.android.calendar/