If you're the kinda person, like me, who likes to tweak almost any gadget you can get your hand on, you might find this next article interesting:
http://www.smallnetbuilder.com/wireless/wireless-features/30938-dont-mess-with-wmm
I normally go in and disable anything I'm not using on a WiFi router, including WMM. Looks like doing that will limit you to G speeds if you have a N router...