Excel 2007 Bible	Walkenbach's EXCEL BIBLE series is tops, in my opinion, if you're looking to learn Excel. Great for beginners and pros alike.
	Quicken 2008: The Missing Manual	I've read chunks of this one online, and it looks like an excellent how-to for Quicken users.
	QuickBooks 2008: The Official Guide	Ivens' OFFICIAL GUIDE series is the book I picked up when I needed to tackle Quickbooks. In a word: Essential.