YouTube has a test site just like Google Labs where you can try future YouTube technology, new ideas and features. They currently offer a trial of their streaming video chat feature. Here is their description about testtube:
This is where YouTube engineers and developers test out recipes and concoctions that aren’t quite fully baked and invite you to tell us how they’re coming along. Your comments will help us improve and perfect the mixtures we’re working on. So jump in, play around, and send your feedback directly to the brains behind the scenes.