I would be so down. I'm running an offline game right now, and would love to have a place to be a PC again.
There are already sites, like the one above, that are set up to facilitate play-by-post. I signed up for
myth-weavers.com a while ago (same name there) so I'd have a place to save and edit character sheets, but their system seems a lot like rpol (which somehow I'd never heard of!) I think it would definitely be easier if we did it on a site set up for rping, as the dice system, character sheet templates, private forums for individual games, etc., are already set up, and they offer character and map generators. I could even set up a private QC forum on one of them now, and organize it and invite people as they express interest, and then we'd all have a place to start character sheets, and people can practice with the dice roller, and, and, and!
(ahem. I've been wanting to be a PC again for a long time, and I like organizing things a *little* too much sometimes <_<.)
I don't know what edition everyone uses, but I'm most familiar with 3.5. If that's what we go with,
d20srd.org is good for learning the basics, so if you wanted to play but never have (or need to be refreshed), you don't need to drop a bunch of cash on books first.