image resize/scale

What's the best way to generate a thumbnail gallery? No, it's not for Pr0n, I need to do it for our company website. I'm thought about gd, but the old version (which I'm not sure I can get) works with GIFs and the new one uses PNGs. Most of our images are going to be JPGs. I know it can be done, I've seen it on other sites that can't possibly have someone sitting there editing all of them. I'm open to CGI/Perl, as well as PHP, it's just that the rest of the site is done in PHP. Actually, I'm open to anything, since we're getting a dedicated server I suppose I can run whatever I want to. Linux server, of course.

Thanks for anyone's help!

Ntropy