Almost everybody knows Google Labs, where Google releases public beta tests for new product.

But Google is not the only one to have such beta site. Microsoft MSN has their own beta site called MSN Sandbox where you can play with new MSN technologies, look at prototypes, and peek behind the scenes at some of new ideas.

The web giant Yahoo! Also has a public beta section called Yahoo! Research where you can try some of Yahoo’s new gadgets.

The world’s largest ISP, AOL, also lets you sneak previews of new products you can check them out at AOL Beta Central.