We're close to getting this thing figured out but we still need an Arizona Cardinals representative. We could have someone from Niners Nation play as the Cards, but I suspect you wouldn't want a non-Cardinals fan representing your site.
The basic plan is that each site has a representative and we'll play through the 2010 season with each rep, meaning you would likely only have to play one game per week. So, it's not a huge commitment for you, and you'd be able to work with your opponent each week to figure out the best time to play.
If you play XBox, have Madden 11, and are interested in representing your site in SB Nation's Madden season, please email me ASAP at firstname.lastname@example.org with your XBox user name so we can get this going (mention that you're from Revenge of the Birds in your email). If you have any questions, you can email me or leave a comment here.