We've released a new plugin for the P2 theme that we're calling P2 Hovercards. Hovercards are like extra bits of information about particular links that show up when you hover the corresponding inline link or object (for example, check out our Gravatar Hovercards).
With this plugin you can add hovercards to your self-hosted P2 sites. A good example of this is core trac tickets.
I absolutely love that at Automattic, we built in-house plugins that we then share with the world.
This handy little plugin is a huge speed-booster and convenience if you use P2 as your project manager (which you should!)
