You're not consistent on your site with support for 800x600 users, some pages do have it, others don't. I don't mind because I use higher resolutions, but lots of people do use 800x600, believe it or not.
Actually you're trying to support 800x600 and 1024x768, but in reality you use at least 3 major tables on every table and the most import information is in the center table, about 800x600.
So in way you really don't spoil 1024x768 users, because their extra pixels are used to have things like "welcome", "online", "poll", "Counter", "link buttons", etc on about every page! A total waste of important space imho.
Two sections on every page tell users who's online. Only one is enough.
I have a hard time to find the E-mail address of the owner of the site.
Forum is too small, try to use the full screen width like Photoshopgurus does. Now you've made the forum text really small, too small in my opinion.
Two many text colors have been used, it's confusing; I count at least 6. Also, try to be more consistent with your text styles and sizes.
I don't like the thumbnails in the gallery, make them all 100x100, crop part of the original if you have too.
Your top image (header) is way too big, 200 kb is unacceptable for 56K modem users (more than half of the US).
Some link buttons have blue borders, fix that.
I would like to see something more than just buttons, avatars or banners in the gallery.
I consider the forum not very interesting for lots of users. Most of it is dedicated to signatures, banners and avatars (9 sections!), this is not the kind of stuff that most serious artists are interested in. Try to focus on a wider group of people and not only some kids who've just reached puberty.
The links page is empty, you should have added at least a few, should only take 5 min.
All in all I really don't get the impression that I'm visiting a Photoshop site... actually, as a new visitor I'm rather confused to figure out what this site is all about. \:]
It's a good site, but it just needs some improvements in different areas, that's all.