I agree Henning that the innefficiencies of the Nazi system should not be overstated. The proof that the german R&D efforts bore fruit are everywhere. German equipment was superior to Allied, or Soviet in very many ways, so it would be innaccurate to try and portray the effort as totally without fruit. However, the Nazis were just unable to target their resources to anywhere near the same degree as the Allies. There was nothing comparable to the JCS in the German camp, nothing even to compare to the General Board (of the US armed forces)> basically someone would think of a bright idea, convince one of the power barons, and off they would go, spending money and research RM, like they were in limitless supply.
Barons ? Parsifal you seem to have a bit of a skewed view on this.
There was a board which needed be convinced if a new design or area of research was to be granted funding from the nation treasure chest, there werent any Barons needing to be convinced though. The aircraft companies had to convince the RLM first of all, and then Hitler for final approval. Hitler was the one who caused most of the problems, delaying crucial projects, funding completely unnecessary projects (The MAUS) and assigning new material the wrong roles such as with the Me262 which was designed purely to be a fighter but despite this was delegated the role of ground attack a/c by Hitler - you'd have to be on drugs to make some of the decisions Hitler did, and as we know he was.
And as for technology;
One of the reasons Germany was ahead technology wise was because of a huge investment in this area since the beginning of the 19th century and up until the end of WW2. Germany litterally became the worlds center of technology from then on, people coming from across the world to be taught and study in German universities. By the early - mid 20th century Germany boasted over half the worlds Nobel prizes. That coupled with the German culture of perfectionism is what kept the Germans ahead technology wise until the end, but was on the other hand also in part the reason for its defeat as it meant more cost time needed for every product.