I'm also taking my CISSP this year and would like to know what your study strategy was. Anything helps.
I was fortunate enough to have my employer pay for a class (SANS MGT414) when I was preparing for the exam. I took the class in their instructor-led online format, where class is held 2 nights a week, 3 hours per night, for 6 (I think) weeks. I find that format to be better for absorbing and retaining as much information as possible, as opposed to going to one of the SANS live conferences as sitting in a class 6 days in a row for 8 hours per day. I highly recommend it if you can get your employer to pay or if you can afford it on your own.
In addition to taking the class, I did a lot of flash-card type of studying for topics that I was less familiar with or had absolutely no experience with (Orange Book TCSEC divisions and classes, EAL Levels, international computer laws...stuff like that).
Possibly most importantly...I took as many practice tests as possible. The SANS class came with a couple of hundred questions. I used the cccure.org quiz engine (the paid version) which had over 1000 questions if I remember correctly. There are also a couple hundred questions available online for free through syngress...google for the address. I also paid for the (ISC)2 studISCope self-assessment exams because I wanted to take practice exams that were as close as possible to the language/style used on the real test.
I'm not sure of the process now that isc2 has gone to Computer Based Testing, but when I took mine it was pencil and paper, and you didn't get results back for 4-8 weeks. Because of the gap in time between testing and getting the results, I wanted to make sure I gave myself the best chance possible at passing the first time, so I dedicated as much time as possible to studying/quizzing in the weeks leading up to my exam.
Get plenty of rest the night before you test. The exam is long...many people refer to it as a mental marathon. I got through about 80% of it in 3 hours, and took a 5 minute bathroom break just to walk around and get the blood flowing again. Then it took another 1.5 hours to finish up the last 20% and go back and review questions that I wasn't confident in on the first time through.
A granola bar and a bottle of water are smart things to bring with you. Staying hydrated helps your brain work better. You may not get hungry if you finish up around the 4 hours mark, but if you stretch out to 5 or 6 hours, it's a long time without some food in your system, and a granola bar or something similar could be a big help. Ear plugs are also recommended by a lot of people.