daehith informs me there is a way to have a global chat ID on City of Heroes so you can communicate with your friends across servers and regardless of which superhero they're playing. Keen!
Details here on the CoH message boards.
Unfortunately NCsoft screwed up my pre-order registration, so now I have to zero out my whole account and start over. It's all good, though - I was planning on starting all my heroes from scratch anyway once I started up my own account, and the two I already created (Colonel Snark and PastyPaleWhtBoy) are only around level 2 so they're easily taken care of. Once I know my chat ID it'll be easier to stay in touch with everyone. :)