A few interface things which will take some getting used to aside, this seems like a reasonable forum, and it was easy to set up email notifications and such. Also, I second your plan for the determination of other folders coming down the line.
I'm all for splitting out sub boards. I hope it will not get too crazy. For example, the the TDIclub forum http://forums.tdiclub.com/ is a great resource for Volkswagen TDI information BUT it can be way too focused.
The nice part about the MSN board was that there was only one board and you only had to look at one place.
On a personal note, I would like to see a board about BRK and FFH products. A place to discuss Benjamin Moore, Robertson Screws, Mega Blocks and Jazz Air trips.
I guess I'm contradicting myself a bit.