Referral from Free iPods. Sign up here first, then use their offer link to sign up at Blockbuster.
First of all, I'm loving the Blockbuster Online service. In my 2 week trial (ending today), I've managed to get about 8 or so movies in - and I have yet to touch the in-store coupons. For $15 per moth, you can probably get about 20 or so movies rented, plus the 2 free in-stores. Great deal if you like movies.
If 5 people use that link and sign up, then I'll report on whether Free iPods is legit.