the Denver scheme.. near as I can tell (based on what ive been told) is just like any other blocking scheme when it comes to pass blocking.
Its the run blocking that is different. Instead of having an assigned target to block when the ball is snapped, the linemen select thier targets based on who is coming at them, and which direction the ball is being run. What this basicly means (I think) is that the blocking is more fluid and "complete" since the defense cant trick the Oline into blocking someone while they squeeze a guy into the hole. It also means (again..i think) that the greater mobility of the Oline can stretch the blocks out further, and create larger holes to run through.
This is all stuff that I THINK is the case..based on bits and pieces I have picked up. Im sure there is someone here who can give a more technically sound breakdown of how it works.