WordPress may ping Technorati out-of-the-box. As bloodylamer explains, WP-CaTT is an easy way to access Technorati’s tags easily from an individual post.
BTW- I’m working on bringing the comma separator back.
WP-iCal has just turned v0.9. It now uses the postmeta table to store the event’s location, start time, and end time. The latest version can now be found at: https://garrickvanburen.com/wpical/