Whizbang Dustyboots
Gnometown Hero
I haven't played it myself, but the first thing that comes to mind is They Came from Beneath the Sea!, which is all about 1950s atomic horror monster movies.Just to drag the thread kicking screaming back on topic:
What system would you use to run a campaign inspired by something like Them or 8 Legged Freaks or other atomic horror giant bugs?