Kidney Donations to Perfect Strangers

I heard a piece on the CBC yesterday about kidney donation. A woman in Toronto donated her kidney to a perfect stranger who was in renal failure. It was a painful story to hear, as they detailed the red tape they needed to wade through to make it a reality (doctors, psychologists, counselors) before the Canadian health system would let her donate.
By coincidence, I found this story this morning, at Craig Newmark’s blog, how several people were using craigslist to find a kidney donor.
I’m amazed at the generosity of spirit that would enable someone to do this for a friend or relative, let alone a stranger.