Version 0.8.1 has been released and the page has been updated.
The latest stable is based now on the nightly version 20121112 rev 8505, since the newer nightlys have serious stability problems.
You can download the new release below or you may use the updater to update from 0.8 to 0.8.1:
Windows (32 bit): Siedler25.org
Windows (64 bit): Siedler25.org
Linux (32 bit): Siedler25.org
Linux (64 bit): Siedler25.org
Mac: Siedler25.org
You will find instructions for a manual installation in this post (click "Show english version"):
Rttr.info
Yeaaay i downloadet it right now :) !!!