I had an 802.11g network set up. It is too early to adopt this technology in my opinion. 802.11b interoperability sucks. You lose a lot of speed and distance with B cards on a G network. Speed with G was good though. The acces spoints (Belkin brand) would always crash like 802.11b would in the early days. I was constantly checking for firmware updates too.

For an office, I think you would want stability and 802.11b is the way to go for that. Here's a good deal for an 802.11b router and PC Card.