This script allows you to open your vpn connection by launching an application. I use it to connect to a vpn from Alfred (you could use Quicksilver or LaunchBar too). In Automator, search for the "Run AppleScript" action. Double click it and copy and paste the code below. Change your vpn's name on line 3. Then export to your Applications folder …

vpnconnect

tell application "System Events"
	tell current location of network preferences
		set VPNservice to service "yourVPN"
		if exists VPNservice then set isConnected to connected of current configuration of VPNservice
		if isConnected is false then
			connect VPNservice
		else
			disconnect VPNservice
		end if
	end tell
end tell

Thanks!