According to this new post on Ilia Alshanetsky's blog, the latest release candidate for the PHP 5.1.x series has been posted over on the PHP downloads page - version 5.1.2RC2.

The second and final RC of 5.1.2 was packaged today and is now available for download. This has been a purely bug fix RC that addresses a number of crash bugs and does a bit of further tweaking on the date functionality. Please test it as much as you can, since pending any major problems this becomes the final release on January 12th.

You can grab the downloads from here:

• BZipped file
• GZipped file
• and Win32 binaries from here