*fiddlesticks*Off United Airlines.

I cant believe more companies arent trying to copy Southwest. You would think they would say "Hey look at what they are doing and they are still making money, maybe we should try it"

I don't see all the fuss.  Domestic policies for the first checked bag, second checked bag, and subsequent checked bags for tickets purchased after, say, Labor Day 2008:

Northwest: $15, $25, $100
US Air: $15, $25, $100
Delta: $0, $50, $125 (third bag)/$200 (thereafter)
Continental: $15, $25, $100
United: $15, $50, $125

IIRC from an old thread, one of the biggest reasons Southwest is comparatively profitable is their gas futures positions (or something like that).  Take that away, and the general feeling was that they'd be in the red, too, although perhaps not as deeply.  I don't know if all the airlines could go to an avoid-the-hubs scheme, and I also don't know the costs associated with discarding an established hub system.

Where do I sign up?   

Because it really doesn't translate as such.  I'm sure the baggage weight has an impact on fuel consumption.  But mostly, and I suspect you well know it, this is merely an effort to bring in more revenue.  Made by many businesses operating in the red.  In an industry critical to American commerce.