I've packaged what looks the be the final RC for the 5.2.1 release, RC4. This release fixes another dozen or so bugs since the last release and from the given feedback looks to be regression free. That said I'd like to ask everyone to take a few minutes and try this RC with their code to make sure it really is as good as it seems and to ensure no new issues are introduced.
If you come across any issue please let me know via
http://bugs.php.net, this blog, or internals mailing list.
The tarballs for this release can be found here:
http://downloads.php.net/ilia/php-5.2.1RC4.tar.bz2 (md5sum: f50578276f653b1f523150e3ff987f03)
http://downloads.php.net/ilia/php-5.2.1RC4.tar.gz (md5sum: 361197eb2b21b36e2e20cb132da2cf16)