Day 135 and I spent about three hours up in Gimli, MB, shooting the opening race of the MRA motorcycle season.  It was a great chance to play with the 70-200, and work on some high shutter speed and panning shots.  
The weather was great, but the sun was incredibly bright, so expect some blown skies in the pictures, and a lot of pictures to boot.  I shot about 400 exposures, and a good 50% of them are usable, but I picked a few favourites to share.
The pit area was set up with a variety of tents and shades from various competitors and teams:

There were about twenty or so racers all together, and they were kind enough to line up a number of their bikes for me:

Some of the hardware on display was pretty impressive and expensive:

And of course, my friends team, Defiant Motorsports, was in attendance:

You have to love it when the competition flies the Jolly Roger as well:

Now to the racing itself.  Initially, I went with some straight high shutter-speed shots.  I kept the aperture fairly wide to achieve that, and to blur out the terrain and trailing bikes.  This first series was shot in one of the main curves, at f/4, ISO 100 and roughly 1/1600th shutter, manually focused on the tripod:


From there, I moved on to some panning shots on a slower section of the track.  It took some fiddling, but I found that my magic exposure was about 1/160th shutter and f/11 still at ISO 100.  IS is on in mode 2, which allows for movement in one direction for panning, and I handheld all these shots:



These panning shots worked fairly well, and I kept about 1/3rd of these shots.  The bikes were only hitting about 80kph here, so it was a good starting point.
I moved back to the corners for a bit, and tried some different angles to find interesting points to shoot.  I actually had to cross the track to get this angle, please don't tell the guys at the MRA.



Finally, a challenge.  Panning shots, close in, on the main straightaway.  I was about fifteen or twenty feet away and these bikes were hitting 240kph or so at this point.  Handheld again, same 1/160th shutter at f/11.  This was a challenge, and I kep a lot close to 10% or so of these shots, but I consider the fact that I managed to keep any of the a huge victory.  Here are my best two from this section:


All in all, a really fun day, and I got away from the kids for a few hours :D
The 70-200 performed *admirably*.  Sharpness is everything I should have asked for, focus was accurate and fast, and the panning mode for IS made my very first attempts successful.
Love.
This.
Lens.