If you've had your bike stolen in Vancouver or want to have some input into the way VPD resources are used to prevent theft and recover bikes, take their online survey: http://fluidsurveys.com/s/VPDStrategicPlan/
The VPD have been working closely with Project 529
lately, providing lots of pop-up bike registration and engraving services along commuter routes to get as many bike serial numbers registered as possible. Seems like a good start.
I've always thought using "bait bikes" with a GPS tracker down the tube would work well, apparently they're already doing that!