Here's the cover on Amazon (and the version that I have):
There's some fantastic stories and art in this, and it's been a great inspiration for ideas for X-plorers. Really, ANY retro-future game setting would benefit from Wood's work.
It's filled with bubble-helmeted heroes brandishing ray guns, flying winged rockets, and sexy space babes. And of course, lots of grotesque looking aliens! But the single most fascinating thing for me is Wood's attention to detail when it comes to the backgrounds. Things like foliage, or a rocketship interiors are incredible. (My scanner isn't up and running at the moment, but if I get it going again I'll post some more images.)
Besides Strange Worlds, the volume also includes issues of Captain Science, Space Detective, Sky Masters, and a gallery of awesome covers. Some day I'm going to run a campaign that's literally based on covers of Wally Wood comics--I'll just point to one and say "...and then THIS happens. ROLL FOR INITIATIVE."
I believe Amazon now has a softcover version for less than $20, which is well worth it (considering the price creep for the hardcover has risen so fast--mine was about $25). Truly great stuff from one of the best sci-fi artists of the 20th!