But if there's a pairing, I want to know that right off the bat, too (and I figure it makes it easier for people subbing to pairings to find stuff).

I tend to agree, and knowing that's how most people do it, if there was an easy way to go back and add a tag to dozens of posts, I'd probably do it, at least for Torchwood, but there so is not! I wish del.icio.us would add some tools to make mass-tagging possible. I know you can rename and delete, but you can't add, and it seems to me a real pain.

I figured out the + buttons totally by accident. *shakes head*

Me too -- mostly trial and error, thinking there just *had* to be a way to filter posts by more than one tag.