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. If you look at the Make WordPress Core blog, you’ll notice that tagged Core Trac tickets are automatically linked up. So, something like #12345 links to http://core.trac.wordpress.org/ticket/12345.

With P2 Hovercards, we took this a step further. I can set it so that #12345 links to the right place, but then also show some additional information when you hover over the link. The following image is an example of what a hovercard could look like for that ticket:

You’ll notice that it gives all…