I'm actually moving to a much safer neighborhood come June (Packard's Corner) where I will have my own parking spot behind my house. I just had a revlation in the shower (where I have most of my best thoughts) I'm thinking at the new house setting up a motion light and a webcam kinda thing. If the alarm goes off in the middle of the night,

Off-street parking in Allston! Life is good!

Depending on distance/visibility to the parking spot, there are a number of options. Some USB cameras include Win software that will do this by out of the box. Smarthome.com has setups like this, but cameras and software are spendy. There are some home automation projects like "Mister House" for Linux that may have camera add-ons, but I don't know.