not fresh, but I've suggested these in the past when this question comes up:
We should add only a very few new forums at a time if we are going to make wholesale changes to the list. Otherwise, it gets to be too much to read/sort through. I imagine it would be hell for the mods, too.
I don't see the point of breaking down the Platforms section into individual consoles or adding a bunch of new genre categories - the forum areas for all these get sufficient traffic now but not an overwhelming amount.
I also don't like the "HS parking lot" idea as a place to kick arguments. It is a bit derisive, and having one's discussion getting "moved" there would probably result in some hurt feelings or possibly people leaving the site. Unless you are engaging in out-right name calling/insulting or offering some other kind of argument without substance, I don't see why threads that engage in deep or heated conversation couldn't be a part of any of the forums. There is a report button and threads can be locked.
Based on what the other posts have suggested, here's what I think makes sense. New forums are marked with ***:
***General Gaming (anything that doesn't fit elsewhere)
Game Reviews (I'd move this up the list as it deserves more attention)
***Games as Culture (the Philosophy, Art, and Social Influence of games)
***Game Rooms and Archiving
***Off-Topic (topics not related to gaming)
Buy/Sell/Trade (open to people who have been a member for 30 days or more)
***Game Deals (post deals, brag about finds, etc. - open to all)
***Auctions (eBay links and general discussion of auctions - open to all)
Hacks and Mods
Sony and Microsoft
***Other Genres (RTS, FPS, Sports, Platformers, etc.)
There's a whole set of discussion on this topic here: viewtopic.php?f=15&t=15685&st=0&sk=t&sd=a
And that's not the only thread we've kicked around ideas in...is there any reason we haven't seen them implemented previously? I know this is an "official thread" but seems that this topic comes up regularly, we all spin our wheels and come up with good suggestions and then....nothing.
Well replace Bob with "Nintendo" and there you go.