I would like to be able to write solos like at the end of this video of jeff waters

http://www.youtube.com/watch?v=of4L3jY4Q9A

is any theory how to write something like this that is really powerfll

...srry bout the noob-ness

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That's just blues scale. Basically F# minor pent (the track is a one-chord F# groove) with a lot of bending. I think he might add a 9th here and there.
And there's a couple of nice chords at the end, right up on 9/10th fret (simple triads, but a nice contrast with single-note stuff).
And he just improvised that, of course, he didn't "write" it. (Not dissing the man's creativity, he's only demonstrating a guitar.)
If you know your scale patterns, this stuff is pretty easy. No theory required. Playing at that speed is a tad harder, of course.... But that's just practice. (hehe, "just"....)

speed wise i kill(in a good way) just nothign sound shas powerfull has that does

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