check out this thread:
http://www.jazzguitar.be/forum/impro...tml#post131687
there are several good exercises posted in this thread, but hopefully my link will take you to post #56 with a video posted by Reg. IMHO, this should be it's own thread in the 'Getting Started' forum, maybe a sticky. I started working on it the day after he posted it and it's helped a lot. I don't know about making you a virtuoso, but it will increase you speed, finger independence, and picking skill if you do it everyday.
Reg posted another video further along, similar but based scales. Haven't worked my way up to it yet, but it looks good, too.....
Hope this is constructive..... for a beginner like me, it's a definite aid in addition to listening to the masters....