I constantly take my MacBook between work and home and always used to wonder why Tiger didnt have a way to automatically detect which network I am on and apply the corresponding proxy settings, etc. (A nice feature in Windows Xp b.t.w where it can do beter in proxy detection). This tool is all it takes. Apple should make this a feature in Panther.
Giving a 4-stars because the UI in the preference panes could be a little bit more intuitive.