When doing personal stuff online, the Connect dialog for my employer's VPN pops up sometimes. I would prefer to disable the VPN connection (just like I can disable my wireless connection while physically connected to a network).
In FireFox, this is an annoyance at some sites (http://forum.zonelabs.org
, for example). In IE (which I use very little) it is a show-stopper.
I'm using WinXP Pro and its built-in VPN client.