That's a cracking shot - great work!
That 70-300L looks like an awesome lens. I've had a lot of people recommend the 70-200 lenses to me recently, but really don't like the big bulky glass. Far too impractical for my needs. This one however is much shorter (physically) while being able to give more on the tele end, correct?
I may have to start saving for this lens...
The only downside is the f/4 to f/5.6