While researching tambourines, I came across this interesting
document (pdf) about the instrument. It talks about the history of the tambourine (goes back about a thousand years!) and gives specifics about playing techniques, including the "7 functions of rock tambourine". It extensively analyzes the use of tambourines in Beatles, Rolling Stones and other 60's recordings (Ringo played tambourine on "Love Me Do", while the drums were done by Alan White).
I am now excited to get another tambourine. Screw samples and loops.