Just a quick note: It says I have a macbook pro on my sigature. I do have one. I also connect a Dell XPS 600 (XP SP3), Dell 1420 laptop (Vista Ultimate), and an HP LaserJet 2420 (usually on the USB port, occasionally on the WAN ((RJ45))port. So far the airport has handled everything. I've had best results when setting it up from only the computer that uses the direct ethernet port. Add all the other stuff - wireless, USB - afterwards. Also, the Bonjour utility, which you can download from Apple's support site, is quite useful in setting up the printer.
If you want to see what the IP address of the airport actually is, you can go to Start, Run, type CMD (brings up a dos window), then type "ipconfig" (no quotes) and you will see an IP address for "default gateway". That is the address of the airport, when you have to use the "Other" option. Similarly, the command "ipconfig /all" (no quotes) will give you the IP addresses of all the devices connected to the airport.
OK, it wasn't such a short note.
Bon Chance - dave