One of the obstacles I faced when first confronted with the Sequences was figuring out the prerequisites for any given post. At times this is spelled out explicitly, but there are many parallel paths and cross-referencing. Another problem was that posts don't link forward to the posts that reference them.
TrailMeme lets you "blaze a trail" through a mass of blog posts by creating a directed graph, which other users can then "walk." The site is still in Beta, and can be unstable at times.
I tried to more or less follow the posted pre-requisites and link-backs, but culled a lot of the redundant ones to reduce confusion. I found one pre-existing trail, and invite anyone with free time to contribute! Trails so far: