A while ago I wrote about Cache Actions, and how it could be used to control your cache using Rules. Since then, a new shiny version of Cache Actions has hit alpha status. Better support for panels and support for varnish has been the focus for this release.
Sometimes you wish you could have more control over you cache in order to invalidate it when it is necessary, and be able to invalidate specific parts of the cache that has been updated. One approach to do that is to use Rules together with Cache Actions.