Bad idea, because half or more are unapproved.
Yeah, I'd be willing to help approve themes and stuff, given some basic guidelines.
I have another request. I've noticed not only a lot of unapproved addons, but also some that were left unfinished/unupgraded.
For example, the FeedDiscussions addon (from what ive read in comments) is approved but still needs some things added, like category selection and source URL. This would be an excellent addon for new forums to jump start their website.
Also the Tagging plugin needs to be updated to include the newer tag cloud style display.