NOTE: Currently PPTP VPN is not working on Android OS 2.1, 2.2, and 2.3.
You can setup a VPN connection on the Droid as long as you don't check PPTP. Apparently this won't be fixed soon.
http://code.google.com/p/android/issues/list?can2&q
pptp&colspecID+Type+Status+Owner+Summary+Stars&cells
tiles
http://androidforums.com/evo-4g-support-troubleshooting/140775-post-froyo-vpn-issues.html
– Main.FredPettis - 2010-09-02