I had my Xbox 360 on an 802.11g network. Unfortunately it was getting too much interference from my controllers and cordless phones to be able to consistently stream media from my Windows Media Center PC. Last weekend I added a new 802.11a access point (I double-checked that the Linksys router was listed as Xbox Live Compatible due to my earlier travails) and traded in the 802.11g wired-to-wireless bridge for the Xbox network adapter.

Right after I did it I was able to stream all evening without a single dropped frame. A couple of nights ago, though, it was a bit more spotty. I might have to fool with the router placement or something.