My £35 rebate for the Speedlite 580EX turned up today - like madferrit, I didn't get round to sending it until the last day.
The really frustrating part of the rebate scheme, though, is that there was £70 rebate on the EF 70-200mm f/4L. I bought a (much more expensive) EF 70-200mm f/2.8L IS during the term of the rebate scheme, but the rules were clear - you couldn't have the rebate except on the precise models specified in the booklet, apart from any changes Canon made during the scheme (which was, as I recall, allowing you to use the 420EX rebate coupon for a 430EX).
I decided not to sacrifice the bar code from my 70-200's box in an almost certainly futile attempt at getting a rebate - I figured that if I sell the lens, the purchaser would probably prefer the box to be intact. It was hard enough cutting the Speedlite's box, even though there was a reason for that, and I cut out the bar code section neatly using a scalpel and straight edge.
David