Tumblr is awesome. Especially if you're a Spanko. Not to mention addictive. And solely responsible if someday I end up a flabby old man with atrophied legs and dying of complications from a Vitamin D deficiency.
I have often failed to give sufficient source credit to these blogs, and I do apologize for my lack of internet etiquette. But I hope to make amends by posting a few targeted plugs. So...
This is one of the best of such sites:
Tush Spanking Art ...and the Giblets
A few samples: