Rebates and savings start today
First, the news: Canon today announced a major rebate program on several dozen lenses as well as on its lineup of Speedlite flashes, all of which are available at Adorama. With instant rebates worth $40-$350 (depending on model or lens/camera combination), this program may push Canon lens owners thinking about upgrading "one day" off the fence.
For first-time DSLR owners who bought their cameras with kit lenses, now may be a great time to upgrade. While you could extend your focal range with an ultra-wide zoom such as the Canon EF 8-15mm f/4 (above; normally $1,388 but you save $170 under the current rebate) and a telephoto zoom such as the classic Canon EF 70-200mm f/4L IS USM (below; $1,249, minus a $300 rebate), consider simply upgrading to a better mid-range zoom lens, such as the Canon EF-S 15-85mm f/3.5-5.6 US IS zoom ($734 minus a $120 rebate), which extends your zoom range a little but gives you much better glass and, as a result, improved images.
You can also use the rebates as a reason to explore Canon's Macro (save $150) and Tilt-Shift (save $200) lenses as well as to increase your telephoto reach with a $40 rebate on Canon tele extenders.
Go to the Canon Lens Department at Adorama or look at the links on the right side of this page for a full listing of lenses that qualify for rebates.