We're in this together now

 Anybody know how to search for posts by a specific user in communities when there isn't a tag for them. I know that whatever it is gets typed into the address bar, but I can't remember it, which is pissing me off. :(

Edit: Found it! Had to go searching back through my history and I'm posting it here in case people fancy using it.

http://community.livejournal.com/COMMUNITY_NAME/?poster=POSTER-NAME

For example:

http://community.livejournal.com/spn_gabriel/?poster=sin-stained-ink