I love Guitar Techniques Magazine, comes out once a month and is around $17.
http://www.musicradar.com/guitartechniquesIt has more than enough information for a couple of months. Always has classic rock and jazz, sometimes blues, country and classical. And then one special feature: reggae, cuban, african, etc. Usually one acoustic song and theory every month. It comes with a CD and backing tracks, along with tab and music. Worth every cent. And if you don't see anything for that month, skip it. Like I said each magazine has plenty of info.
The music radar
http://www.musicradar.com site has articles under "tuition" Here's an article on 40 great blues intros and outros
http://www.musicradar.com/tuiti...intros-and-outros-442747.
I've never really used the website because I get the magazine.
Good Luck
Victor