I am sure this has been discussed and suggested to death already, but I agree with Slash above. My suggestion would be the following:
Some manual moderation in the wish list, or some way to delete Non-PC games, duplicates and the duplicates of duplicates with typos and "Plz relese FIFA2010! kthxbai!"-suggestions.
Possibility to flag clearly inappropriate content. Just like Slash suggested.

I would like to see a way for someone who solves a question . . . to be able to distribute rep points to others who contributed to the solution. In short, assign a standard 1,2 or 3 assist points for up to three other posts in the thread. Have an "assist" button on each post available only to the person credited with the solution. Although I have given a +1 to others, it doesn't seem to add anything.
The person posting the question decides who best answered their question but often it is two or three posts combined that actually solve the problem. I have gotten so caught up in detailing a process that I have left out a critical step only to have it added by another member and my post was still selected as a solution. It would be nice to give them credit. Have the page mark the solution and any relevant assists as well. I believe it would give a much clearer view of a solution.
I would like to give credit where credit is due . . .=)

Very good idea, +1

Thanks . . .=)

Agh, giant thread! Zjeraar's suggestion please!
Sorry if this has been suggested, but I'd like to see singeplayer and multiplayer categories in addition to price, ratings and genre.

I am still relatively new (4 days) but I love the site, and the good work the guys at GOG are doing.
Only thing I can think of that is slightly annoying, when downloading the game I wish the setup file and all the extras came in one pack, so I don't have to go back and download 6-7 different files.

Oooh, I like that idea :)

It's not even really annoying, just a convenience sort of thing. I believe it would make it easier on the servers this way too.

1. I think it would be worthwhile to provide MD5 hashes for all downloadable files (but most importantly the installers). If you do this, please ensure that the text is selectable to facilitate easy copying into the user's local hashchecking application.
2. I'd really like to see "Gunslinger" added to the Gender list in user profiles (terribly minor detail, but hey, what the heck).
EDIT:
3. If it can in fact be done (I'm not sure of the details), I think it would be nice to have a "Blacklist" that effectively hides games from the catalogue. A reverse Wishlist, if you will. There are a number of games available here that I will never buy (just not interested), and it would be nice to be able to mark them once as unwanted, and then never see them again in the main catalogue.

Apart from the games I've bought on GOG (you guys are great btw), I already own a number of the listed games on CD/DVD. It would be great if I could mark those in the listing of the games available on GOG. That way it would make an easy filter for all games that I don't have yet, without the clutter of those that I already have (GOG+CD/DVD). (reposted here after recommendation)

More language versions for games especially polish. Don`t forget where GoG comes from

.......A browser based game where we fight DRM themed monsters. jk, idk....

With all the new or updated stuff being added by the GOG team it would be nice to have a little red or green graphic based on download date that would let us know if there has been anything new added to the games we have purchased and downloaded. A green graphic if nothing new since our last download and a red graphic if something new has been added since our last download.

A couple of things:
1. I think you should use mobygames.com in some way, maybe provide a link to the page of the game or something like that. I think both communities share interests and loves in the world of video games, it would be wonderful if you can help each other in some way.
2. I'm really interested in game sales statistics. vgchartz.com never gives sale statistics of PC, for instance, so it's always difficult to track how well PC is doing in general. It would also be interesting to be able to know how many users are here and maybe see their catalogues and such. I really want to track how gog.com evolves.
3. Also, there are no tools to browse the wish list. Buttons like "order alphabetically" or "go to last" are really needed when a newcomer (like me) wants to go through all the list to vote wished games for the first time.

I'm not tired of requesting this yet ;-) :
I think that "My games" page should contain a lesser amount of games so that they could be organized in different pages/sections of one's account. And pages/sections should be fully customizable (name, number of games, sub-sections, etc.).
Am I asking for the moon? :-)