Looking for an excellent finger-style exercise? Then you’ll definitely want to check out Study No. 1 by Heitor Villa-Lobos from ClassicalGuitarMagazine.com.
GuitarWorld.com has a great lesson on the playing style of Duane Allman. Tons of tabs and video included!
Devin Shawn has a beginner country/bluegrass lesson on YouTube on strumming. Complete with plaid and a giant cowboy hat.