I downloaded an open-source HDR program, Luminance HDR (used to be Qtpfsgui, apparently) and didn't get very far with it. I was using 3 RAW photos, shot from a tripod, and in the image-aligning stage it took so long that I canceled it and decided to try with just 2 of the photos. Again it sat and sat and sat in the image-aligning stage and after 40 minutes I decided it just wasn't worth it. (Duh!)
I tried it again with 2 different images and it still just sat there, apparently trying to align them. (The "in-progress" indicator was going, so it wasn't just locked up.)
It's true my processor is just 2.2 ghz and I only have 3gb of RAM, but I'm inclined to think there's something else going on. Or does it really take a super-duper computer to do HDRs?
Edit: Never mind! I was obviously using the wrong program. I just downloaded Picturenaut and it works fine. (Seems like I should be able to delete this thread...)
Edit #2: Okay, I see why I couldn't delete this thread. It's so I can say, "If you think you just might want to play a little bit with HDR and see what you think, DO IT! IT'S COOL! And Picturenaut is free. (The documentation is imaginary, but...)