Canon rebates
Canon is offering rebates through Jan 17, 2009 (this happens just about every year).
My two top picks: the EF 70-200mm f/4L IS USM (or the f/2.8 version), the EF 16-35mm f/2.8L II. Just be aware of sample variation.
If you’re a buyer, your purchases through the B&H and/or Amazon links are greatly appreciated.