Dynamo is still a new kid on the block; and it sure has made a lot of buzz lately at RTC as well as AIA convention. However, there is really not a lot of resource out there where you can learn at your own pace. I just came across lately and found two that is worth posting here. So go ahead and check it out now if you want to learn Dynamo!
http://dynamobim.org/blog/ (By Autodesk)
http://simplydynamo.blogspot.com/ (By Marcello Sgambelluri)