Videos
The University of Nottingham Presents
The Perioidic Table of Videos
How Stuff Works. Here's a link to the top chemistry applications.
The Khan Academy - Sometimes the lectures tend to wander and may not be on topic for most high school chemistry.
In my opinion, the best sites for chemistry science instruction follow. Step-by-step ease provided by DeWitt. Crash Academy is also good for instruction. Crash Course has a manic energy that makes science seem almost fun.
A variety of resources, not just videos from NSF
NBC/NSF creates videos describing common substances.
View and download educational videos, songs, activities and more. User name and password are required.
The Annenburg website produced The World of Chemistry, in 26 parts.
From Wired Science:
Our friends from the UK present
Chemistry Videos and Photographs
It is a site for chemistry teachers.
At least it will not cost you anything.
Here's one that is fairly convenient. If you do not know what it is, perhaps tech isn't your thing.
Crash Course
TED Education (Search Chemistry)
Edutube
Demonstration Videos
http://www.pkwy.k12.mo.us/west/teachers/anderson/videos.html
More fun and interest than educational