The late evening light gets better this time of year. These are with the new lens to, a sigma 17-70 2.8-4 macro. I like it a lot so far, it's very versatile and sharper than the old canon 17-85 I've been using for years.
I've got some more pics in the Bozeman Magpie in an article about the alleycat races. It was a pretty fun gig chasing bikers around with a camera for a few hours. Check it out: