I have heard rumors that a 108mbps ABES is coming out sometime this summer. I am not sure where I read it, but I was just posting to see if anyone else had heard this. Supposedly they were putting a second chip in that will double the current speed which is 54mbps to 108mbps. If anyone knows an estimated date that would be helpful.
To use 108Mbps, you don't need a second chip. You only have to use an Atheros chipset. Current AEBS don't use those and the AE card would also have to be based on the Atheros chipset. When I was doing my purchasing for basestations, I was careful to choose those with Atheros chips (my laptop already had it) and I've been running it ever since. Chips don't increase through-put, it's just the Atheros has an instruction set for a different method of using the g protocol. (Currently LinkSys/Cisco have pushed the FCC to investigate to see if they broke any regulations; I call it sour grapes they didn't think of it first)
My neighbor bought one of those 108Mbps wireless routers, and it absolutely killed my Airport Extreme base station. I kindly told him about it and explained the problem with 108Mbps, and he took it back and got a basic G router. Glad to have nice neighbors, he had no idea that they caused that much interference.