You can get over an hour of constant-on use on a CRV-3 rechargeable battery. If you're shooting RAW, get a LOT of memory. I generally go through a 1G card in a single dive. (I bought a second one last week when Fry's had an in store sale for $49.95) Hopefully, bigger xD cards are coming. I heard that faster ones are.("H" series?) I ordered a Sunpak strobe, because I'm suffering "photoshock" on my budget. It is slave only. If you check out Wetpixel forums, CE4Jesus bought the Oly strobe and UW case for it for about $200 on E-Bay stores auction, which does all the functions but lacks power. From what I understand, if you want to use TTL, it's either the Oly or you have to get a special adaptor for your S&S, Ikelite or Inon. I don't know enough about the strobes to really answer that one accurately. If you're not using RAW, you can shoot hundreds of JPEGS on a gig card. You'll find that starting out, the standard UW macro and UW wide settings work really nice for basic JPEG pictures and you can branch out from there. All the shots in my gallery were done with this camera. Feel free to ask about any of the setting info, as there are lots of choices and the advanced manual is about as clear as mud. It took me almost 3 months to get fully comfortable with all of the manual settings, and I'm barely there.