Actually Ed,
I have a totally wireless network and have zero issues with Vista on a wi-fi. I use a Broadcom 54g internal card for my laptop, and a Linksys54g Router/DSL/Phone (it is the VerizonOne thingy.. ) I have a few other computers on my network and they run fine and see my Vista machine with no issues. It depends what type wi-fi equipment you are using, some still arent compatible (like some of the NetGear stuff).
Good luck.. If you have any questions, just let me know. Happy Computing!