2.0 is about to go to RC-1 status. This does not
mean that it has been officially released. However, there are versions available for testing, RC-1(pre) is availaible on the project page
. However, the very latest version is only available via CVS, for more information on that, see here.
Please remember that phpBB 2 is not officially released, and should not be used as anything other than a test - not as your main forum software. If you want to use phpBB 2 as your main forum software, please wait until the official release, which should be reasonably soon.