It is very sensible and feasible - well, I would say that as I have done something very similar. Wireless networking with USB adapters is pretty easy but can be frustrating when things don't immediately work as its not obvious what the problem is.
click here for a good thread on the basics of how to set it up with all the static IP addresses etc (192.168.0.x)
I use sitecom USB adapters WL-003 click here which I got from PC World. They have quite alot of wireless networking kit in there at the moment. Just don't bother asking for their help or advice. The WL-008 kit (which contains 2 WL-003s) seems to have all the software you would need (I say 'seems' as what came with the WL-003 was rather lacking)
The Windows Wizards should sort everything out for you but if you do encounter any problems then just post back here.