That's supported and even required for some router updates.
I am thinking of getting a laptop - probably a Compaq V6310, with a wireless modem. We currently have a wired router connected to cable modem and 2 desktop PCs. We also have AT&T cable phone connected. The PCs have Win XP, the laptop will have Vista. If I change to a wireless router, is the configuration the same? Can the cable modem, phone modem and both PCs still be connected via cables, but the laptop use wireless?