Moniker (my registrar of choice) allowed users to delete and get refunded (minus a very small fee) domains right from the control panel. I used this myself a couple of times in the past 4 years. One was a typo and another one was a client that had second thoughts about a domain I registered for his company.
Very handy.Moniker rocks.
There is one way to find out if a man is honest -- ask him. If he says "Yes" you know he is crooked. -- Groucho Marx