I would love to participate but not having dove for 3 years makes me feel a bit underqualified. Needless to say, once back in the water I'll be right back at it and I have a few new ideas. I'm curious about the magic filter formulations.
One of the developments I took advantage of prior to my drop from the edge of the earth was Thomas Fors' ACR calibrator. Since I got my camera body and CS3 (yesterday) I gave it a practice run again last night. One thing I plan to play with is running custom calibrations using filter sets, lenses and strobes (and possibly shoot the test chart underwater).
I've been looking for filters that can surpress cyans without blasting out blues equally. I've found a gel that does that to some extent but I haven't been able to find strobe filters to match.
You know, videographers shoot filters and ambient light all the time.