NewTeeVee has a post detailing changes comScore is making to count not only page views, but video streams and embeds.
Liz Gannes includes a table showing that Revver is likely underrepresented in the Hitwise numbers LeeAnn Prescott posted a month ago.
As I posted at the time, services like Revver and Blip.tv that have an embedding strategy have to be evaluated against the other video services in a similar fashion. As embedding is added to the vast majority of video sites, page views alone won't show an accurate picture of utilization. As advertising moves into video, accurate metrics will become crucial.