Then to the actual software side:

Making a simple telemetrics package to poll, store and send the GPS and accelometer data should be simple (can be done in python if you don't mind the [relatively small] overhead). This could even be sent over GPRS link.

I'm not sure whether it would be better for the N900 to push the data streams to a server on you laptop or have a simple server process on the n900 your laptop can pull the data from. Probably running a server on laptop and a simple pushing client on N900 is better (less work for the N900).

Video is more tricky, I guess you could tunnel X11 but that's about as bandwidth inefficient as it can be (though probably would be easiest to set up as a proof of concept).