Nextbyte got back to me today
about my query about the Software Coupons that came with my iMac. They
said the coupons are actually issued by Apple and that all I had to do
was come into their store and pick up my copy of iLife '05, which is
great, because I'd been reading in MacFormat all about how to do stuff with iPhoto and iMovie, but I was like "Hey, I don't even have that version on my machine".
Now I have an iLife ;)