In addition to the camera body rebates [listed yesterday], Canon is also offering some lens rebates (that increase if you also buy a body at the same time!) Here's a few lenses that are particularly good! These apply through 1/8/2011.
Canon EF 16-35mm f/2.8L II USM Autofocus Lens [$1,520.00 - $100 = $1,420.00]
This is my favorite lens on my Canon 7D because it's wide, but also a zoom (though because the 7D isn't full frame, the lens really becomes a 24-50mm zoom lens.) It also has IS. A lot of people go for the 24-70mm f/2.8L, which is $1,300 (no rebates) but there's no IS and one thing I don't like about that lens is that the barrel extends as you zoom; the 16-35mm doesn't do that! But I also prefer wide angle lenses!
Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom Lens [$2,269.00 - $200 = $2,069.00]
Canon's 70-200 f/2.8L lens has been very popular with pros, and they just updated it this year (though goosing the price considerably!) This lens is great for shooting bands in bars; lots of light and you can get closeups! At $2,069 it's now only $170 more than what the previous version, the 70-200mm f/2.8L IS, is selling for.
Note that Canon sells a variety of 70-200mm L lenses, with minimum apertures of f/4 and f/2.8, and with and without IS. The cheapest is the f/4L without IS (only $649), though if you're looking to save money I think the better choice is the Canon EF 70-200mm f/4L IS USM Lens [$1,210.00 - $80.00 = $1,130.00]. One advantage of the f/4L over the f/2.8L is that it is quite a bit lighter: 760g instead of 1490g and physically a bit smaller too.
Canon Normal EF 50mm f/1.2L USM Autofocus Lens [ $1,459.00 - $100 = $1,359]
This is a really fast 50mm, and if your $99 EF 50mm gives up the ghost, maybe you should replace it with this! If you have a Canon 5D, this is a "standard lens," but on the T2i or 7D it's more like an 80mm.
Canon EF 100mm f/2.8L Macro IS USM Lens [$944.00 - $60 = $884.00]
It was only when I tried to do a shoot that involved lots of close-closeups that I realized I didn't have a macro. I probably wouldn't buy a plane 100mm lens, but with the macro this lens becomes incredibly useful.
Canon Wide Tilt/Shift TS-E 17mm f/4L Manual Focus Lens for EOS [$2,200.00 - $150 = $2,050.00]
I'd love to have a tilt shift lens; both for taking shots with tall vertical lines (like buildings) as well as for doing those "tiny model" distorted shots that seem to have become the rage. But the lenses are expensive! The Canon TS-E 24mm f/3.5L II Tilt-Shift Manual Focus Lens for EOS Cameras [$1,940.00 - $130 = $1,810.00] is a bit cheaper, but not as wide. I'd probably save up for the 17mm!