One thing I've spotted, from all of those videos above, with their athletic strong arm QBs, they like to roll to one side, and go deep to the other.
Now, not all QBs can do that. I know Grossman can't, Beck couldn't (our linemen didn't like him, because they were constantly getting hit with balls).
But I seem to remember Mcnabb doing some of those things--rolling to the right, and then hitting Fred Davis on the far left side of the field etc...
Actually, when Mcnabb was in DC, there was a time when I was like "damn, I have NEVER seen the skins hit the deep ball like this". ...and I was right, I beleive he led the league in passes over 50+ yards (I am going off of memory here, but I know it was somewhere a long those lines).
Bad thing is, he wasn't very good in the short-medium passing game, and Grossman was better at moving the chains and getting first downs.
It would have been interesting to see Mcnabb with Helu (a running back we drafted a year later, who is a good pass catcher out of the backfield).
But man, Mcnabb could hit that deep ball:
http://www.youtube.com/watch?v=YXcHPV3Ny2g