PHPTalk 0.9.4 has been released:
PHPTalk aims to be the fastest and most configurable multithreaded message board system available. It has the usual features like multithreading, auto indexing of messages (for searching), customizable colors, etc. However, PHPTalk differs in that it allows you to easily integrate it into existing sites. It does this by not relying on specific display files, allowing you to template most of the frontend, and allowing you to specify an already existing user table. It uses PEAR’s DBI for portability, ANSI SQL for portability, an advanced and documented API, full multilingual support, and full i18n support for date functions.
I can’t say that I’ve used it, but it looks clean and different from the other multitudes of php bulletin board systems.