Oooooh, a blues thread.
A couple blues discs that I'd recommend:
Jimi Hendrix: "Jimi: Blues"
Amazon.com: Howlin' Wolf/Moanin' in the Moonlight: Music: Howlin' Wolf
Stevie Ray Vaughan - "The Sky is Crying"
Elmore James - "The Sky is Crying"
Albert King - King of the Blues Guitar
At the very least, grab the Jimi disc (which will surprise you) and the Wolf disc (two of his albums reissued as one,. which just simply kicks ass).
Hubert Sumlin's solo on Wolf's "Spoonful" makes you wonder whyt he fuck anyone was so excited about Clapton.
The two "Sky is Crying" albums are fun, because you get to see two great blues singers each put their stamp on a great song - James' original, and SRV's excellent cover.