Oh sorry... My Netgear router is a WGT634U, using WEP password.
The Apple Extreme uses no encryption (just a hidden SSID) as I use it to allow my Powerbook 550c, Duo 2300c and some other old-ass hardware Apple made years before wireless was thought of (!) to access the internet.
As I stated above, the Wii connected to both w/o a problem, and I used the Wii browser on both connections, finished, turned it off and continued to browse the internet on my computer (for, uh...er...hardware items! Yeah!) on into the night. Even in the morning I browsed for a new job before leaving for work(!)...
....only when I came home did I discover there was no internet connection. needless to say, this NEVER happened before I connected the Wii to the internet.