Historically, the 580 EX II had a $50 instant rebate during Winter 2009, so the rebate isn’t as good (unless you buy the 5D Mark II at the same time) The $100 off on the 7D looks like a great deal, especially for such a new camera. One of my favorite lenses for indoor use is the 16-35mm, $200 off w/ the 5D II is a good deal.

I typed up the hightlights from the flyers below.

Flashes:
$15 instant rebate for the Canon 430 EX II ($30 if you buy the 5D Mark II)
$25 instant rebate for the Canon 580 EX II ($50 if you buy the 5D Mark II)

Lenses:
$30 instant rebate for the Canon EF 100mm f/2 USM ($60 if you buy the 5D Mark II)
$80 instant rebate for the Canon EF 24-70 f/2.8L USM ($160 if you buy the 5D Mark II)
$100 instant rebate for the Canon EF 16-35mm f/2.8L II SM ($200 if you buy the 5D Mark II)
$130 instant rebate for the Canon EF 85mm f/1.2L II USM ($260 if you buy the 5D Mark II)
$500 instant rebate for the Canon EF 200mm f/2L IS USM ($1000 if you buy the 5D Mark II)

Cameras:
Canon 7D (body only) $100 instant rebate = $1699 – $100 rebate = $1599 MSRP
Canon 7D EF 28-135mm IS kit $100 instant rebate = $1899 – $100 rebate = $1799
Canon 7D EF 18-135mm IS kit $100 instant rebate = $1999 – $100 rebate = $1899

Source:
http://www.crunchgear.com/2010/03/05/its-spring-rebate-season-for-canon/