As a science fiction nutt, I find my old collection of Analog SciFi book covers to be an EXCELLENT source of inspiration for me.
Typically you can find pictures of the covers on ebay and other scifi sites.
One good resource is here:
http://www.krazydad.com/visco/
(Just move your mouse around the images and when you see a cover of interest, click it for a larger view ;-) )
-Wil
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