A good group to join if peonies are your passion. Helpful and informative, as well they have an annual seed and root sale.
The most informative site on peonies. You can use the database to research specific varieties. Take advantage of the helpful information from experienced growers. This is a wonderful site if you need help choosing a peony variety.
A wonderfully informative site on grafting apple trees. They provide useful videos on all aspects of this process. As it is based in the UK many of the trees are not hardy here but the instruction he gives is easily understood by the novice gardener.