Last year we did a pick 'em pool through ESPN.com. I'll try to put this as politely as I can: it was awful. I didn't realize how bad their system was beforehand, and it wasn't a good experience. Sorry about that.
For this year, we're switching to Yahoo! Sports' system. I believe we've used it in the past with good luck, and it has more customization features. For instance, I've set it up so that every SEC game will be on our list each week regardless of whether teams are ranked. "Yahoo!" indeed.
So here is the link for our group (group number 3675). It's called "Team Speed Kills" appropriately enough, and the password is secspeed. Picks won't go live sometime next week, but that's because football starts next week. Hallelujah.