are there any GL2 demo site..?? or do u guys know what site in action that use GL2 ..?

I do not think it is mature enough for that yet.

Yup, GL2 still has a long way to go. Most of the code currently finished for GL2 at this point is back end stuff. While parts of the authentications system are finished, there isn't really anything that is demoable at this point.

There's a short (and admittenly slightly out of date) status on the GL2 Wiki.

-Vinny

thanks for the fast response. it's ok, i'll wait for GL2 release & will try it. one more thing, i hope there will be a way to migrate my GL1 to GL2 once GL2 is officially release. ( if only the migration is necessary for me.. )