The 108mbps is just marketing bullsh!t. I have a d-link standard g at home which works just fine... i only have a b card though... but here at work we have the "super-g" dlink, and while it works fine now, we had a LOT of problems getting it to run... we had to turn off the super-g capabilities to get it to hold a connection between the computer and the internet.
Throughput to the internet can NOT run at 108mbps... in fact, I don't even think it can run at 54mbps... the only time that matters is in local networking, doing file transfers between computers... otherwise the 108 means nothing.
