For the most part yes. However I did post a thread about using third party adapters.
The Nintendo brand adapter uses a specific model number of chip. There are other manufacturers that bought/use the same chip. If you can find a model with the same chip the Wii can be "tricked" into using it.
Unfortunately your linksys adapter will most likely not work.
Any reason you aren't using the on board wireless?
edit: voila http://www.wiichat.com/nintendo-wii-...tible-wii.html