I'm not sure if you have access to the lessons on GT but if you do check out Doug Fearman's section

http://www.guitartricks.com/instructor.php?input=16587

Doug had multiple tutorial where he shows you how to play rhythm and lead over different chord progressions.


You might also want to look at Christopher Schlegel tutorial on major and minor pentatonic.

http://www.guitartricks.com/instructor.php?input=155014

HPcrazy also has some great improv tutorials

http://www.guitartricks.com/lesson.php?input=10593
http://www.guitartricks.com/lesson.php?input=9845&s_id=195

Hope these helps.