Oh Man! Thank you for your reply, this is exactly what I was looking for. My wife and I decided to make Washington D.C. this years destination after finding this: http://washcycle.typepad.com/bikemap/ on the internet. It is one of the best bike maps I've encountered on the web. With your information as a guide we'll feel better informed and more comfortable on our adventures.
And, yes a lot of my peers are stuck in the '70's, in fact the last time I was in D.C. was 1972, I had blast! But these days I'm looking for a lower key kind of experience.
Thank you again for your time and effort putting together this reply. We should be in Washington D.C. in early October.