If you've been browsing around on B&H you may have noticed that there's some instant cash rebates for a lot of Canon gear. Here's an example. There is a list of all the cash rebates on the Canon site since they are all manufacturer rebates. The rebates are all good 10/12/2009 through 1/16/2010.
Since my friend Mark and I are both thinking about upgrading our 16-35mm original Canon wide angle zoom lenses to the newer Canon 16-35mm f/2.8L II Mark pointed out an unusually insightful review on fredmarida.com (it's the review by matanuska).
The reason I point out this review out is there is always a lot discussion about which is the best Canon ultra-wide angle lens; the 17-40 f/4L or the 16-35 f/2.8L II. Everyone is sure the Nikon 14-24 f/2.8 is better but is it better enough to loose auto-focus when used on a Canon body? I think matanuska lays out a pretty rational comparison of these three wide-angle lenses. I've all ways rated the 16-35 higher than the 17-40 in my lenses table, but I've never run across as good an explanation of why as matanuska gives.