Also try to break out of regular patterns, you will have to do this slowly at first! This article shows you the concept, it's taken from Steve Vai's 30 hour workout (or something like that?!?!) and is a chromatic scale which alternates finger sequences, 1234, 2341, 3412, 4123 etc then moves on to string skipping.

http://www.ibreathemusic.com/article/143/1