I've been using Greg's High Performance SEO, and have been generally happy with it as it is fairly light and powerful.
However, I decided recently to migrate my forums from phpBB to bbPress, and discovered that Greg's kills bbPress.
The developer now offers support only at his website. And his basic response for incompatibility is try it with the other plugin, if it doesn't work, use something else.
So I am on the lookout for a light, good, easy-to-use SEO plugin (as opposed to a medley of 10s of different plugins). All-in-One seems to have some good reviews.
Does it play well with bbPress?