Elliot S! Maggin is considered by some to be the High Kong of Superman Writers. Those people may be right. I mean, come on, the man has an exclamation point in his name. They don't just hand those out, do they? Otherwise, you'd have a bunch of people running around saying, "Hi, I'm Dave! Jackson," or something.
But I digress, because I am both tired and soaring off the Red Sox Game 7 ALCS victory (more on that in a bit). Forgive me.
Anyway, Maggin wrote a number of great Superman tales over the years, not the least of which are two novels released around the time of the first two Superman films. The novels, "Superman: Last Son of Krypton" and "Miracle Monday," are pretty highly regarded, but sadly out of print at the moment. You can find 'em used on Amazon or on eBay without having to pay an arm and a leg, but if you're short on cash (or just lazy), you can read 'em both for free online thanks to the people over at the Fortress of Solitude.
You can read "Last Son of Krypton" here (with bonus material not published in the U.S. version) and "Miracle Monday" here. There are even eBook versions for your Palm Pilot if you're so inclined.
I started reading LSOK earlier this evening, and it's pretty good so far. There's a fantastic sequence with Lex Luthor where Maggin gives some great, original insight into the character's personality and motivations. And MM ties so strongly into his later comic book work (particularly Superman #400 and the two DC Comics Presents annuals with Superwoman) that it should definitely be worth reading.
If you're a fan, have some free time, and don't mind reading books on the computer (I'm not nearly "Star Trek" enough to ever fully adapt to doing that), they're well worth checking out.