I have the WRT54G with the latest linksys firmware (v4.00.7) and 2 computers using Trendnet tew-421pc (pc card for the laptop which is running windows xp sp2) and tew-423pi (pci card for the desktop which is windows 98se) and these cards are both wireless G. I installed the drivers and they seem to be working. On the desktop, I'm using the provided trendnet wireless connection software and on the laptop, I'm using the windows wireless zero thing. When I connect to the router, it takes a while, but it can connect. BUT, it has 'little to no connectivity' so I can't access the internet or anything on the network. Right now I have wireless security (WEP, WPA, whatever) disabled on the router, but I'll try and enable a WEP and see if that changes anything.