I was using a Belkin F5D6050 802.11b wireless adapter in place of an Airport card on my iMac G4. Mac OSX drivers supplied by Belkin. Netgear router. Worked great for Internet and filesharing. I upgraded to a Belkin F5D7050 802.11g adapter using Ralink drivers (No Belkin mac drivers available) to get it working and works great for Internet but iMac to Powerbook (Powerbook has Airport extreme installed) filesharing suddenly really really slow in one direction only (accessing files on the iMac). I'm using OSX 10.2. Any ideas???