There's currently something of a gold rush mentality going on with the DVD rental companies here in the UK. Dozens of them have sprung up in the last few months and they're all trying to get your business with free introductory periods.
Using this handy list, I'm planning to get free DVD rental for the next few months, cancelling at the end of the free period.
The services are actually pretty good, and the prices keep coming down. I might end up keeping one of them after all the free periods anyway, though I'm not enormously impressed with the range of the current one, Love Film. I think the range could be wider.