I noticed some talk on the board about Digital Cameras & housing combinations. I'd like to add a recommendation
I purchased a Sony CD300 and an Ikelite housing a couple of months ago. I've been very happy with the results. The CD300 stores images straight to 3.5" RW CDROMs which are nice. I took a stack with me to Palau a couple of months ago and it worked out excellent. You don't have to worry about EMI screwing up the disks when going through AP security
I came back with 780 fairly good photos on 14 CDs which are resuable. The Carl-Zeiss lens produces very good results. The only quirk I've had is a jog control knob on the housing which is easy to fix with a rubber washer and some glue 
If you have considered going with the CD300 checkout my web site It has some of the photos I've taken with it over the past couple of months.
http://photos.dchess.com
I purchased a Sony CD300 and an Ikelite housing a couple of months ago. I've been very happy with the results. The CD300 stores images straight to 3.5" RW CDROMs which are nice. I took a stack with me to Palau a couple of months ago and it worked out excellent. You don't have to worry about EMI screwing up the disks when going through AP security


If you have considered going with the CD300 checkout my web site It has some of the photos I've taken with it over the past couple of months.
http://photos.dchess.com