After Paul's presentation on patchwork at the 2008 Kernel Summit, there has been wider interest in patchwork setups for other projects. Patchwork originally hosted the Linux on Power and Linux on Cell lists, we've since added netdev, linux-mtd and linux-ext4. I've also added the main Linux Kernel mailing list (lkml), just to see how the new patchwork handles the load; all has been okay so far.
If you're interested in installing the new patchwork at your own site, you can grab the source from the patchwork project page. Installation can be a little tricky, so feel free to mail me if you need a hand.