Recently, I've posted these instructions for installing PDT 2.2.0 from the update site. The new version of PDT contains numerous performance improvements due to the new indexer. As always, please report bugs if you encounter any.
BTW, big thanks to Jacek Pospychala (and Nickb's support, of course :-]) PDT has moved to using Athena as a builder. Watch live PDT builds if you have permissions, of course :)