downloading vs. streaming

Someone was telling me a while back that there was a way to download youtube vids as opposed to streaming them.

That would be really cool 'cause lately I've been waiting forever for some of those videos to stream, and some never come... is anyone else having this problem?

This site, boomvid, claims to allow downloads from various video sites inc. youtube, google, daily motion and others. All you need to do is follow these simple instructions at their HOW TO DOWNLOAD page...

I tried several times but was unsuccessful each time.

I'd love to know if anyone else has any success with this site...