Watch the Function Junction Solo online guitar lesson by Jeff Scheetz from Blues-Rock: Secret Sauce
The "mp4:secret sauce" here is Intervallic playing. Basically using more interesting intervals in your playing - trying to break out of the standard up-and-down the scale riffs that we all get stuck playing and relying on too much from time to time.
We can play Melodic intervals - which are basically notes played one after the other in succession (like playing up and down a scale). Or we can play harmonic intervals, which are notes played at the same time (like playing a chord).