I just installed the Windows 7 release candidate for the third time. For some reason this hadn’t registered with me until now, but the installer is actually designed to detect any wireless networks that happen to be in range. You can set up wireless networking as a part of the initial installation process. I absolutely love this feature, because it means that when Setup is complete, you are already connected to the network and are ready to go.
I haven’t seen tha automated installation kit for Windows 7 yet (if there is one), but I wouldn’t be a bit surprised if you could specify a wireless network and an encryption key within the installation parameters.