We've been working lately helping kaltura port their module to drupal 7.
The cool insight I found is that once we where able to migrate the kaltura node to a fieldable entitiy, their is tons of stuff we can now do with video fields associated to various elements.
Just though of sharing some of the usecases I toyed with.

Video on Comments
Let's say you want to communicate soley using video.
You post a video in a node and the commenters answer inside the comments by recording a video of their selfs from the kaltura field in the comments

Video powered bio for Users:
Imagine a linkedin clone or a dating site with an intro video per user.
By associating the kaltura video field to the user we can have his bio as a recorded video - instead of the classic bio text.

Category video
Imagine taxonomy image on steroids! , The Kaltura field can be any type of media (picture, audio, video).
Now think about a site that has a category for elephants - you could post the taxonomy video in the head of the taxonomy page, showing a video about elephants alongside the tagged nodes.

If you're going to DrupalCon Chicago we'd love to show you some d7 kaltura coolness in our booth (#73) Stop by and grab a (drupal)lager as well.