If your wireless router has a setting to enable this, click it on.
Geeky explanation:
http://en.wikipedia.org/wiki/IEEE_802.11e
Translation: I stumbled upon this option in my router's config program. The default setting is off for some reason. Once I turned it on my connection has improved dramatically. Sustained download speeds are way faster over wireless and I didn't change jack shit on the cable modem.
Try it, you'll like it. :thumbup: