Is it time to start calling out bad cyclists?

I've thought about printing up Cycle Training cards and handing them out to offenders on my commute.

But previous experience tells me people don't like to be TOLD.

HA! I've thought of this kind of thing before...
Would be awesome to have some sort of un-removable (is that a word?) glue to stick big stickers on cars who have been total wankers, we're talking hit you from behind then bollock you for being on the road and then drive off!