Regarding the tutorials, the problem is that you're using a forum as a library. I think it would be better to have a site similar to GimpScripts, say GimpTutorials, where tutorials can be filed, categorised, tagged and managed by a librarian working to a defined set of guidelines.

Kevin

I agree and add more:

Tags (preferably with auto-suggestion, so that different users will not invent synonymous tag-names, and thus redundancy, ambiguity)

tutorial preview images in search results (for effects, logos, or "before and after", where applicable)

discourage animation in user's avatar!
that's really distracting and against any website usability recommendations!
common guys, i am here already, reading your post - there's no need to catch my attention!!!

don't allow images in the signature....
we all want to show-off but signature images... :
1) confuse me from the actual post/tutorial images !
2) force me to scroll a lot (then i'm losing the context and my mind ...)
3) takes more time / CPU to load and scroll
4) that's what avatars are for!

suggest users to embed images instead of link to someplace else.
it's much faster to decide (in the forum and in RSS) if this tutorial/post is relevant!

last administrative note:
the registration captcha isn't very good: i failed to separating between fish and bird names (and my english is relatively good, so how many times other users fail to enter captcha?).
it's bad for accessibility, but then - if someone's using this board then he/she can operate GIMP, thus drag & drop isn;t an issue

The simple solution for this is to do what I do, turn off displaying signatures in the user control panel:

A nice improvement for this site could be to make the board index sortable, by equipping the header cells of the table with clickable arrows allowing to order the open threads by a specific category among the available ones, such as "Topics", "Replies", "Views", "Last post", etc.

I think it might also be worth adding the capacity to browse all the open threads listed in the uncategorized section of the home page, that is not only the most recent topics but also the older ones, which would be easily fetched by placing at the bottom of the page the numbered links to the successive pages, including "Go to page" and "Next", as it is already provided in each of the special forum sections.