I kicked around this idea a bit in the HotS ID Topic, now it's for real. The name of the chat channel is "giantbomb" and right now it has two people in it. Join it now and you'll never have to think about it ever again, it'll just be there. Then there'll be 3 people. Forever.
Seriously though Chat Channel's a way better way to get groups together than trading IDs in a thread. All you gotta do when you want to play is say "whassssupppp let's fucking do this!", say what you're looking play (coop or qm) and lo and behold you will get an invite. Or someone will say "Yeaaahhhhhhhhhh let's murk em" and ask you for an invite. Then you will declare each other friends and get hell of bonus XP. It's real simple and great!
Again, the chat channel's name is "giantbomb". I hope to see lots of people in it soon! And lots of people using it as well. To join you can type the following command.