Here's a couple places to get some information on how to grow shiitake mushrooms it really is fairly easy to do.
I have a few logs going now and hope to do some more in the next couple months. Hopefully if they aren't producing at the time of the Gathering I can force them the week before and have some producing for the people to try.
A couple things to remember are that the log has to be fresh cut and be a hard wood tree of a suitable variety. The logs once inoculated to be kept in the shade and need to be moistened once in awhile when it's dry out. As I have found out you can keep them too moist to produce as well.
If you want more info PM me I have more links that I would rather not post on the site. I'll also try to get some pics of mine in the next few days and post them