Satya, Dave and Sayed, Congratulations on getting the book out.
I just skimmed through the TOC for the book and did not see anything on SpringAndroid. Does your book touch this aspect of Android programming?
I went to Stir Trek in Columbus, Ohio a couple of weeks ago. There was some talk of Titanium. Mostly good. They also pointed out a few of the gotchas to be careful of; for instance, iOS has an event that is fired when you reach the end of a scrollable list view, but Android does not. All-in-all nothing that can't be worked around. Again, mostly good comments, just warnings that you should expect it to be the end-all-be-all for cross platform development.