Based on the XBox 360 network tuner wizard here are some things to know:
802.11a or higher has the least amount of wireless interference. (802.11a is better and can be considered as coming after 802.11b – although both were created at the same time).
802.11b does not support many of the features required by Windows Media Center (802.11b is an early extension to 802.11 standard and is not as good a technology as 802.11a)
802.11g may produce choppy or slowed TV and video (this standard incorporates the best of 802.11 a and b standards)
802.11n is the newest of the standards and consequently considered as the best of the technologies.
More Info: http://en.wikipedia.org/wiki/IEEE_802.11