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"Gateway" - great, classic novel which I found amazing as a kid and which still impresses now. Aside from it's literary merits it left me excited about physics and scrambling to learn more about Chandreshekar's Limit, Cerenkov radiation and what was known about black holes back then.

It's sequels weren't up to the same standard but still quality writing and great entertainment - "Beyond the Blue Event Horizon" introduced me to what Pohl called "gosh numbers", a separate, fun topic in itself along with the topic of human personalities running on hardware. Pohl was one of the rare writers - SF or not - who's name of the spine of a book usually ensured that the contents wouldn't be a complete waste of time.