CISSP - Getting started?

I decided to look at other qualifications after completing a raft of Microsoft qualifications recently, which included:

• MCSE:Security 2003
• MCSA:Security 2003
• MCTS:ISA 2006

Although the product I specialise in are Microsoft based, they do not utilise anywhere near the knowledge you have to learn for an MCSE, so working for a Network Security Distributor, the CISSP seems to fit better than the MCSE!

My current bedtime reading is this: http://www.dummies.com/store/product/CISSP-For-Dummies-2nd-Edition.productCd-0470124261.html

It's only to whet my appetite, until I have the time to read the proper books!