THere use to be dialpad.
There was another one that I can\'t remember. It rocked. You put your number in and the person you are calling\'s number in. It then called you, told you to hold, and it then called the other party. You got a three minute call right away and after that you just had to click on the site once a minute to keep it going.
I used it exclusively for about a year and I think they went down when all the internet companies failed.