Here are sites from that list that work on the iPhone, not off the top of my head, but actually verified.
EPSN redirects to m.espn.go.com/wireless/index?w=197wt&i=COM
eBay redirects to iphone.ebay.com
USPS redirects to mobile.usps.com/iphone
UPS redirects to ups.com/content/us/en/index.jsx?flash=false
Weather.com redirects to mw.weather.com
The only possible exception is
FedEx, whose full site works, aside from the Flash-based self-ad called their "Promotions Center"
mobile versions of those sites suck...especially for a quad-core 1gzh custom chip attached to a near 10 inch screen. Those mobile sites are less than a great internet experience, and far LESS than a current average user gets on older, average computing devices. I'm calling fail.