Oops- you're right. The 24-105 L does have IS. I missed that. Not being an f/2.8 lens I hadn't looked at this one as much. So I guess Canon does have an L zoom in the short end. Still no primes below 200 though.

I wonder about the Tamron's AF speed. I know they can make good (and bad) IQ lenses. I have their 90 macro and am quite pleased with the sharpness (granted on 1.6x sensor).