I recently purchased a Linksys Wireless Network Bridge (the WET11) in order to put a desktop G3 in a remote part of the house on the network without running wires. The WET11 has the advantage that it connects to your computer (or anything really) via a simple ethernet cable, and turns it into a wireless device capable of communicating with an Airport network (or any other 802.11b wireless network). There are no drivers to install and no compatibility problems.
However, there is a small snag. After playing with the WET11 for several hours, I could simply not get out to the Internet. I could see the DSL router, and all the other computers on the network, but no Internet. This really had me baffled, because the WET11 doesn't really do any filtering; it's supposed to just pass the information through. Hooking up a cable proved that the settings on the Mac weren't the issue, and I spent quite a long time on the phone with Linksys tech support to no avail.
Hooking the WET11 up to a PC worked like a charm. On the Mac, it was restriced to the LAN only. It just didn't make any sense. I finally, out of desperation more than anything else, tried changing my whole network addressing sheme, and lo and behold, now everything works fine. So, if you want to use the WET11, there are a couple of things you need to know.
Mac OS X Hints
http://hints.macworld.com/article.php?story=2002112506464280