Get a copy of the Interval Crabwalk PDF here.
Interval Crabwalk
Thanks to everyone who attended the webinar! If you missed it it can be seen here. The audio is a little choppy at the beginning, but the rest is fine 
To practice intervals on the guitar I suggest the following:
1) Play the interval crab walk as described in the webinar.
2) Play Super Scale Trainer in Quiz mode for intervals.
I would start by concentrating on min 2nds, may 2nds, minor 3rds, and major 3rds. Spend a week just singing, playing, and quizzing on those.
More to come soon!