[quote name='mtxbass1']Lets make a clear difference here.
11 mbps stands for 11 mega BITS per second. (device speed)
3 mbps stands for 3 mega BYTES per second. (cable speed)
You are insane to think that 11 mega bits is faster than 3 mega bytes.
8 bits is equal to 1 byte for those that don't know.[/QUOTE]
Ummmm, your cable connection is running at 3Mbps (megabits per second), not 3MBps (megabytes per second). That's top-end speed, and may not get that fast all the time.
802.11B runs at 11Mbps at optimal speeds, though that's optimal speeds, when you're right next to the router, and even then, it's more like 6-7Mbps. Still faster than the cable modem pipe, when running full-tilt, by 2x the speed.
802.11B will work fine for running a Xbox on XBL. And that's a very good price on it. Should work without any issues on Linksys gear, and most likely with other brands of gear as well.