Protip for Tokina 11-16mm f2.8 users; don't drop your lens 2.5ft (0.8m) onto concrete.
A connector on my home-made camera sling slipped out of the camera's strap loop, and boom. The lens was mounted on my 60D, which came away with only a scratched battery grip. I wonder if my 20mm prime would have survived, since in this design, the zoom action forces the main structural casting into a peculiar, spindly configuration. You can see the aluminum casting's three broken connections to the mount ring and electrical contact sub-assembly. As a MechE, I can't help but notice the aluminum casting's extremely coarse grain and considerable internal voids, both of which make the part weaker than it could be (at, of course, increased cost). Still a great lens for the price, and it's asking a lot for any lens to survive this.
I'll either get the lens repaired, replace it with the pro version (whose price has dropped), or try to find an autofocusing f2.8 or faster prime in the 12-16mm range for less than $600 (search is fruitless so far). Sent an e-mail to Tokina, but no word on repair feasibility yet. They may just laugh in my face.