Ed Finkler has released the latest version of his Inspekt input filtering/output validation library for PHP5:

I've uploaded the 0.3 release of Inspekt, the input filtering and validation library for PHP4 and 5. With this release, Inspekt completes the goals of the original specification for the OWASP SpoC007 project. I believe it is ready for "real-world" use.

Along with the new code being released there's also more documentation, API docs, a PEAR channel and a mailing list.