Cheques are still useful to a large number of people. One example, Ebay. Most people take Paypal, but there are still a number who will only take cheques.
And don't forget pensioners, the majority of whom don't have credit cards, using only cheques and cash.
One other quick point, most people don't use cheques anymore because credit cards are so common. But look at the way Egg recently cancelled the cards of 160,000 customers. They claimed it was to get rid of risky customers, but it turns out a lot of the victims have been people who keep their payments up to date....thus make the company less money. I'm sure many of that 160,000 will now be dusting off their cheque books. And if other companies take the same line....?
The cheque is certainly not as dead as the image presented by the companies who can no longer be bothered to accept cheques, but its death is being forced upon us.