I too like Gripsed on YouTube. Sometimes his little ticks and sniffs become irritating but, if you can get past them, the content is good.
There is also some good stuff here on CardsChat in the Strategy Articles
I also quite like thepokerbank.com
where they have two sets of videos from guys with different styles as well as lots of articles.
I am not sure what the situation is for USians but PokerStars
has it's pokerschoolonline.com
which has lots of excellent videos and articles (same on FullTilt but can't remember the name of their training site ). As I say, I don't know if they allow USians but if they do, very useful.