MediaWiki 1.5alpha1, the first unstable release of the 1.5 series of the software that runs WikiPedia, is out.
There's some important release notes there:
** WARNING: USE OF THIS ALPHA RELEASE MAY INFEST YOUR HOUSE WITH **
** TERMITES, ROT YOUR TEETH, GROW HAIR ON YOUR PALMS, AND PASTE **
** INNUENDO INTO YOUR C.V. RIGHT BEFORE A JOB INTERVIEW! **
** DON'T SAY WE DIDN'T WARN YOU, MAN. WE TOTALLY DID RIGHT HERE. **