Thumbnails misaligned. Can someone tell me what I can do to fix the thumbnail positions?

NSFW:
http://www.nudesack.com/gallery/index.php?album=eva-longoria

At first look.. it looks like there are a lot of mis-aligned pieces on the page. Like for starters.. I would say the size and margins/padding for #main need to be modified to fit better on that page.

There is a utility called firebug which works really well for troubleshooting css problems.