Some background links:

Talk: N900 PPTP VPN with MPPE

Bugzilla: Support PPTP and L2TP out of the box

OS2007 Download

Just in case this is useful (I don't know much about VPN protocols):

Maemo 5 Downloads: OpenVPN Applet

So I guess this brainstorm proposal needs to address two steps:

1. Enablers in place.
2. Simple UI to manage connections.