Hope this isn't too far off topic, but Barry you mention Tabata squats to muscle failure which is my current obsession. Given that they come up so infrequently in the WOD I've been adding them to the end of workouts that I don't find overly taxing "cardio-wise".
My question is whether this is a bad thing in the long run. My knowledge is limited to the "What is Fitness" issue of the journal (and a few bumbling searches of the site) which seemed to indicate that the tabata protocol would not sap strength like traditional "cardio".
I'd likely be better off mixing it up to include burpees, kb swings, wall ball, etc., but I'm really hooked on that whole inability to walk thing I get after the squats.