The "G" run

What is the "G" run when do I use it and what notes are in it?

Generally speaking it means play something in G major, i.e. solo using the notes from the Gmajor scale.

When you were referring to the "G run" or "Lester Flatt-run" always used in country - and bluegrass music, it goes like this:

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-------------------------------P--------0--------------  H=hammer on

-------------H--------0------2--0----------------------  P=pull off

------------0-1-----2----------------------------------

----3--------------------------------------------------

What is the value in practicing scales and chord progressions? Should I work on one more often then the other?

Learning scales improves your soloing; Chord progressions improve your rythmn and song-writing. I feel that learning chords is a little more important because it helps stretch your hands out and allows your brain to adjust to unusual finger positions.