Not possible (driver doesn't support it).  AFAIK, the ACX100 Texas Instruments chipset is the only supporter.

That's too bad. I know US Robotics has software for their wireless cards that supports 256 bit encryption. I guess 128 is enough but 256 would still be cool.

Thanks anyway

US Robotics (and the D-Link AirPlus (22mb) line) use the TI chipset I linked to.  There are a couple manufacturers that use it also.  To get the 22mb rate and 256-bit encryption, you must have all compatable equipment - regular "b" equipment (all use 128-bit keys max.) cannot associate with an AP that is set to 256-bit encryption.  A plus for safety but restricting.

I still connect at 54mbps so its all good. The unit is supposed to have an option to enable some special technology which makes the 54mbps run at 100mbps but i don't know where to enable it. I think you need to have the US Robotics wireless card for that option.

You are still only connecting at tops 3-4MBps to the internet, at best.  The 54Mbpx is the speed of your internal LAN, not your connection speed to your ISP.

To answer the other about the 108mb rate, that chipset is also propriatary and you'd need a compatable wireless card to connect to the 108mb capable router.  Can't remember right off the top of my head the manufacturer of the chipset - A something IIRC.