I searched around a bit on different sites and came up empty. Is there a list kept somewhere showing the total number of releases to date for both formats?? Thanks much!

Just tally up the reviews from Highdefdigest. I think they review pretty much everything, so the number should be pretty close.

From engadgetHD.com: HD DVD 343 vs Blu-ray 369*

* Blu-ray total does not reflect 32 Paramount titles that were previously available.

http://www.engadgethd.com/page/3/

http://www.blu-raystats.com/
http://www.hddvdstats.com/