http://www.guitartricks.com/lesson.php?input=9069
http://www.guitartricks.com/lesson.php?input=10313
http://www.guitartricks.com/lesson.php?input=1096
This tutorial by Kevin Tailor is very interesting, Shows you how break away from the simple strumming by adding new elements to your playing.
http://www.guitartricks.com/lesson.php?input=9595&s_id=179
Altho there's no video in it, this tutorial is about funk rhythm guitar, pretty cool stuff
http://www.guitartricks.com/lesson.php?input=7948&s_id=68