ORIGINAL: RangerJoe
I thought that the "Blitz" part came from the speed that was issued to the German soldiers.
For sure Guderian understood how the technological progresses of the tank and the airplane could be used to develop a new kind of warfare - but the correct term should be "the dawn of combined arms." Also, Guderian was the first to admit that he developed organically ideas coming from him and military thinkers like De Gaulle, Tukhachevsky and Liddel-Hart (*). His seminal work, "Achtung Panzers!" was not a secret document of the German high-command: it was available in any common library! Just think about this: if you were a French General in 1936 and wondered what you could face in a war with Germany you only had to walk into a library...
Then in June 1940 you had to deal with characters like Rommel, who basically led a single-division parallel war with his romp across France - and almost paying an high price for it at Arras. But, of course, if you win you are right.
Anyway, a proof of Guderian genius (his ability to develop the new doctrine further than anyone else) was the understanding that your "speed" is limited by the speed of your supply train. Not only the troops but also the supplies were able to race across France. The German tanks often had barrels of fuel welded on them; the French tanks had both smaller fuel tanks and an abstruse logistic train: many a counterattack failed because the tanks were in one place and the fuel in another (usually on a train). While other "modern" military theories had also reached the idea of using these new "combined arms tactics" to breakthrough and roam in the immediate rear, only Guderian showed that you could breakthrough and then go on, and on, and on. It's no wonder that when the race for the Channel was on the German High Command almost had a collective heart attack.
(*) While Liddel-Hart in considered one of the proposers of this new theory, some say that the friendship he developed with Guderian after the war led the latter to be a little more complimentary towards Hart than his merit deserved. But this is not a can of worms I'm interested in.
"Yes darling, I served in the Navy for eight years. I was a cook..."
"Oh dad... so you were a God-damned cook?"
(My 10 years old daughter after watching "The Hunt for Red October")