If you're a photog, I need you! And if you have a computer and the Internet (hardy har) I need you too!

I've had a Canon 30D for about 6 months, and I loooooove it except for one thing - almost ALL of my indoor pictures show up fine on my LCD, but when I load them into Photoshop or into a folder on my computer, they are underexposed. I can fix it with Levels or Curves in Photoshop, but it's annoying (and time consuming) to have to do that with every single indoor picture I take.

Does anybody have a clue what's going on here? I can't find any help in my manual. Is there a setting that I'm not using correctly, or what? I'm letting it do everything automatically (AWB, etc.) except sometimes I manually speed up the shutter speed for action or slow it down for something like birthday candles.

Attached to the 30D is a Canon 580 Speedlite. Direct flash is almost always too harsh, so I usually use the little white bounce card that is built-in to the flash or I bounce the flash off of the ceiling.

Over the summer, before I had the 30D, I used a friend's 20D (with the same flash) for a wedding, and had the same kind of problem. So I don't think the camera is defective or anything.

Any help is appreciated! I'm beating my head against a wall over this issue.

Another thing - have you voted in the last 24 hours in the weblog awards? I think first place may be out of reach (darn you, File It Under, for being more well-known than me and therefore getting endorsements which = votes!) but I may be able to pass Sean Gleeson and Gina Cobb if people will VOTE for me, once per computer (if you have a work computer and home computer, that's two votes - knock yourself out) every 24 hours, until December 15th. Y'all know I love you already, but I'll love you even more if you help me have a decent showing in this thing. :-) Thanks.