YouTube Insight,
accessible from "My Account," lets you easily monitor the performance
of your videos over time. You can also use the demographic analysis
tool to track the age, region, and gender of your audience.
Annotations
allow you to add interactive commentary to your videos (think VH1's
Pop-Up Video). You control what the annotations say, where they appear
on the video, and when they appear and disappear. You can even link
from an annotation to another YouTube Video, Channel, or Search result.
--
Summer reading: YouTube blog roundup