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@phreak we've already seen significant SEO improvements since making this change, I think Google is cool with it.
A documentation update is in the works internally, stay tuned for that. When its done, Vanilla will handle the user tutorial stuff (how to use the actual product) and the API, and you guys can contribute to the developer-focused docs (which we will continue to work on as well).
It is all in UserMeta. It uses memcache and I think APC as well, so try restarting PHP.