I've been fighting this issue for a few days and I'm starting to wonder if their is something wrong. I use an AirPort Extreme which is connected by Cat5 to my iMac and of course WiFi to my Macbook. Problem is that my Macbook displays a wide array of weird things in relation to the WiFi. At it's best it will connect without issue, browse ok but say if I go over the network to play a video off of my iMac, it will hesitate and skip at random intervals. During this time if I run an constant ping to the router I see random jumps in latency sometimes at the same time as the video skips. I can run for awhile in the condition above and then it can turn for the worst even going so bad that I loose all connectivity even though it says I'm still connected to the AirPort with a full signal. Sometimes if I'm trying to recover from the above problem I've had the MacBook list no WiFi networks available. I've had it show networks available but tells me I can not connect to the router when I try, etc. On the flip side, my iPhone and my previous laptop (an HP running Ubuntu 7.10) connects fine and with the HP laptop I can watch the same videos that hang on the Macbook with no issue, perfectly smooth. The Macbook is the new SR 2.0 laptop running Leopard. I've also tried a complete erase and reinstall of Leopard with no change to the problem. I would try going back to Tiger but I can't on this sysetm since it came with Leopard. Any tips? EDIT: I forgot to add that I've also hooked up my Linksys 45g router with the same hesistation problems I described above so it shouldn't be the router. I have tried changing channels on the router though, also changed from WAP2 to no secure encryption, robust connection, etc. No change on any of it.