Warpwire is a tool dedicated to streaming media. If your course has not only video content, but also audio and still-images, Warpwire is the best solution. Warpwire can also be used to create short videos and screen captures by you and your students. It is possible to create a library associated with a course, but also make it open to anyone with a NetID, which makes it easy to share media across courses and store video content.

Warpwire Resources
Getting Started with Warpwire in Sakai
Screen Capture in Warpwire
Uploading Videos to Warpwire Media Gallery
How to Share Content via Warpwire
Warpwire FAQs and Tutorials