Doing MonoTouch stuff - and really quite enjoying myself!
I'd better make it pay though....
The monotouch forums are very useful - lots of code snippets around!
Monotouch.info is a good place to look for links
If you want to write games using Cocos, then check out:
This is a super tutorial
Craig Dunn's blog contains some very helpful posts:
Not monotouch, but useful for that real deployment stage,,,
StackOverflow is always a good place:
e.g. look at this level of info for writing a file - http://stackoverflow.com/questions/1829954/write-to-a-file-in-monotouch
Not monotouch, but for testing apps, this looks interesting: