So I set up a chat channel for people interested in Rated Battlegrounds. It'll probably take a while for it to really catch on, but the more you use it, the more you can tell other people about it. The more other people hear about it, the more it will get used, until it will become really easy to set up a Rated BG PUG just by advertising in the channel.
At least, that's my hope. It's how Facebook got it's start, more or less. And it can work for us PVPers too.
The channel name is ratedbgs and the password is RBG2011.
Look forward to doing lots more rated battlegrounds as this tool gets more widely used. Frankly, I'm surprised there wasn't such a channel already.