Concerning the search, kevnar
has made a good point, indirectly and unintentionally though it were. From my experience in web designing, it's generally best to put things where they're "expected" to be. Assume that much of your clientele come with a specific purpose in mind, and if they can't intuitively get where they need to go quickly, with little to no effort, they may decide to go somewhere else. Much of this "intuition" is based on their experience of the web as a whole. So if your navigation bar doesn't "look like a navigation bar" (i.e. what most navigation bars
generally "look" like), people in a hurry for an answer/product/etc may get frustrated. Sure, you have your "browsers" who don't mind looking in the nooks and crannies of your site, and your users who are quicker than most at adapting to a site's style. But a good site tries to cater to as many as possible.
As it applies to this, almost every site I've seen with search capabilities has a text box, usually in the upper right. Considering the very nature of a forum - a large repository of knowledge containing a few nuggets of gold buried in lots of silver, copper, tin, and hay - having the search function prominent is a must. (Personally, regardless of where the text box is put, I'd prefer a search function on each board of the forum that defaults to searching only within that board, accompanied by a link to the advanced search. If I'm in "Terragen 2 Discussion", I don't want to search for something in "Open Discussion".)
Having said all that, concentrate on developing TG2!
Just idle ramblings, this.