I was recently invited by Luke Johnson (What Revit Wants) to be part of a website dedicated to Dynamo nodes.
It is really nice and clean. You will find there a lot of good input about Dynamo packages, and the nodes that are useful and somehow specific.
Custom nodes documentation is organized by packages you will find in the Package Manager in the Dynamo interface, or on this website:
Some OOTB nodes are also explained, as well as some specific workflows.
Contributors are the packages authors, but of course as he’s the one starting all this, Luke has to be rewarded for this at the first place (and he does most of the job :)!!).
The nodes from SteamNodes package are here too, and I will do my best to explain the nodes functions and workflows they are related to.
Follow @ on Twitter.
Enjoy this, and don’t forget to learn Dynamo.