Finally Johannes Schlüter baked a first alpha-tarball for PHP 5.3. The new version contains a huge amount of new features, like closures, namespaces and late static binding. Such a huge amount requires thorough testing: if you are using a PHP application you would like to see fully working with our brand new version or you are developing a PHP application, this is your chance to make sure everything will go smoothly. If you are a web hosting provider, do your performance benchmarks now!
If you are, accidentally, using the Gentoo Linux distribution, I have something for you: in my personal PHP overlay you can find an ebuild for PHP 5.3.0_alpha1. A few warnings: currently, ext/fileinfo does not compile because of #45636 and of course I did not test all possible USE-flag combinations. If you experience problems with it, just leave a comment here.