I swap between two LAN networks at home and work.It was always a hassle to enter your network setting everytime you changed the networks. Just a day back i discovered Net Profiles a utility that just does that. And more ofcourse it can also associate specific programs with profiles and launch them automatically when a particular profile is selected.It also can do a few more stuff like changing wallpapers,screen resolution etc.A nifty tool for the frequent connection swapper.