Following up on the results of some "berlin" searches here, I'm looking for any input on various Euro and "D" routes out of Berlin. My plan for late May to late June definitely includes Leipzig (already found that cycle route), and I'd like to head down to the Main River route for a bit, then down toward Freiburg or stay north and cross at Strasbourg.

Has anybody done the D-Route 11 from Berlin going South?
Any feedback on the Main River route versus other central Germany routes?
Is it worth it to go even further South to catch the Euro "Rivers" route at Ulm?
How about the Euro "capitals" route East/West, any feedback on that one?
What is the German train policy on bikes for non-ICE trains? Is there a charge (I can't find that)?
Lastly...anybody got a good site in English for the German "AFDC" (I think I got that acronym right) bike association? Right now I'm just translating pages in Google, and I'm getting some cockeyed information.

Any information most welcome. Oh yeah, anybody got a good updated place to rent/buy a touring bike in Berlin? I'm the sort who doesn't mind touring with a less than ideal bike if it means avoidance of boxing/transporting/unboxing/boxing/transporting/etc. my bike.