Tagged browsing should actually work instantly now on the Planet Journals sites; there was a problem with a sub-query taking ages which I’ve replaced (e.g. here are the general tag views from the .co.nz and .ie sites). You can also see related tags for a particular tag on the right hand side.
I spoke too soon – just found another query that was running all last night (and caused MySQL to b0rk) for 48056 seconds (over 13 hours). Eek!
Working again 🙂
Now you can do multiple tags.