I don't know why this is, but personally I think making friendly URLs is a mark of attention to detail. So, with a little htaccess kung foo, you could make links that look like this: http://www.jobpic.com/auction/35 and http://www.jobpic.com/profile/38 instead of http://www.jobpic.com/auction.php?id=35 and http://www.jobpic.com/profile.php?id=38. Better to do this sooner than later.

I like the JS load category, but it should at least be linkable. See: http://plugins.jquery.com/project/history