I've just joined an internet rental service in the UK called LoveFilm (on a month's free trial), and they have a referral service that sounded very interesting...
Basically, if you click here you will get 1 MONTH free membership. If 3 people sign up as full members after that month expires (and it's not obligatory), they will send me an iPod!
I'm not particularly bothered about the iPod -- because I already have one -- but just thought some British readers out there would like a month's free renting!
Please let me know if there's a catch in this offer (in a comment below), but it seemed pretty cast-iron to me... so check it out!