If you own a Blackberry you need a copy of Blackberry Hacks, period. I picked up a copy the other night and have been flipping around in it ever since. I was very impressed with the variety of hacks they featured in the table of contents. There are so many hidden features, shortcuts, etc., available on the Blackberry and the best ones seem to be covered in this book.
Kudos to the team at O’Reilly for publishing this gem. I also offer them a tip of the hat for beating my group to market with our own upcoming Blackberry book. I hate it when that happens!