Here’s the latest on Windows 7 passwords along with how they can be cracked and some tools for doing so:
Cracking passwords in Windows 7
I wrote a whitepaper on BitLocker in Windows 7 not long ago and here are some additional thoughts/tips in case you’re considering it:
Using BitLocker in Windows 7
For additional reading, Paul Thurrott’s SuperSite for Windows is a great resource on Windows 7 and more.