DPS Favorite Lens?

Darren asked digital-photography-school ( DPS ) readers their favorite Lens?
The post is so general, it would be more useful to have a post for each of the main system, such Canon, Nikon, Sony, etc, anyway Darren favorite is Canon EF 70-200mm f/2.8L IS USM Telephoto Zoom Lens
I love it because it is fast (2.8 with image stabilization makes it great in low light) and has a really handy focal range which makes it useful for sports, wildlife, weddings/social gatherings and even portraits.
[ Source DPS ]
