I guess you guys haven't heard of BongTVLive:
http://www.bongtvlive.com/
Exactly what you're after. But instead of 1 on 1, there's 18 webcam spots (!), and you can turn on your (or other people's) audio too. And you can just chat without taking a spot too.
But you've got to register first. Totally worth the effort though, as there's
always people there, and very often full (well the cam spots anyway - there's no limit on how many can chat).
There's guys, girls, young, not-so-young, mostly from the US, but plenty from the rest of the world too. I haven't been on there all that much lately, but when I am I'm known as 'masht'. And say high to Bongrip, the Los Angeleno who hosts and runs the place.