Does anyone know of any good companies that do supported rides across America?

I found http://www.abbike.com/, but the ride I want to do starts too soon.

I'd like to get this done in about a month, averaging over 100 miles a day. I'd even do a charity ride if I could find one that didn't take two months.

Anyone have any ideas? I guess I'm not really into "touring." I don't like carrying a bunch of junk and I like to keep the pace pretty fast.