I just completed an install on Ubuntu Server 8.04 and so far, everything seems very happy. I'll be doing some testing over the weekend and add or update my install guide with the steps I took.
At first blush, it appears that quite a few things have been taken care of and improved with the latest version compared to the version I'm running on my production machine at work (went live back in late March / early April).
Thanks to all of the developers for the hard work! It's very cool that Wikidot Version 1 is still being improved while Version 2 is in full development mode.