Nearly anything by Asimov is worth reading; it's emotionally and intelectually interesting. I never got into the foundation series, though, beyond the first book, but that's because it's not my area of interest, not because it wasn't a good book.
Or, for those of you whose brain might be as confusled as mine feels right now, Foundation series good, if that the type of book you like.
Personally, I'd recomend The Caves of Steel and it's related books. I've re-read that one a number of times; plus, they take place in the same universe as the foundation series, only much, much earlier, when humanity is still exploring a small portion of the galaxy.
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If I only could remember half the things I'd forgot, that would be a lot of stuff, I think - I don't know; I forgot!
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Some of my webcomics. I've got 400+ webcomics at Last count, some dead.
Sig updated to remove non-working links.