No default route for PPTP connections
Ever wondered how you can avoid Mac OS X' PPTP client to set the default route to the remote gateway? It's a bit annoying that you loose your Internet access, if you connect to PPTP server that doesn't allow your packets through to the Internet.
Bitflux has a good description about how to tell OS X' PPTP client not to change your default route. In short:
Create the directory /etc/ppp/peers, if it doesn't already exist. Then place a file with the exact name of your PPTP connection in there. Write nodefaultroute to that file and when you fire up your PPTP connection your default route will stay untouched.