Good work on the new forums, very impressive. There are just a few things I wish were different.
First off, there could be better code formatting. Personally I hate reading code that is untabbed and double spaced. Maybe add personal settings to this? Even just enclosing the code into a "code box" would make things a little prettier.
Second, more room when writing a post. I like the new look of things when you write up a new post, but the text box area is just so tiny especially when posting code.
Third, a preview. I hate it when I submit a post and I think I have all the misspellings and grammatical errors out of it and it's easy on the eyes and then it turns out to be a complete mess.
And finally, spell check. I know browsers like IE 7 and Firefox have plugins to do this, but it is always nice to have it right there in the same area.
Other than that, it is much better than the last version of your forums, again great job!
Edit: This should have been posted in the Site Feedback and Suggestions, sorry.