Here is Date iCal 3.0!
This new version is still in a state of partial completeness, which is why I'm leaving it as a dev release for now. You may need to do some manual fixing to get it working, due to a change I made in the classes offered by this module. Try 'drush cc registry' if 'drush cc all' fails. I plan to fix this as soon as possible.
Please note that ALL of the hooks exposed by Date iCal have changed. They do essentially the same things they used to do, but they're named differently.
The big change is that the Feeds plugin has been completely re-written to conform to the Feeds APIs. It's now much more resilient and powerful. Feeds Tamper will now work, and is in fact the prescribed way to alter data, since I removed several alter hooks.