Chronicles of Thomas Covenant (all 7 of em) - Donaldson (closely followed by Mordant's Need)

Baroque Cycle - Neil Stephenson (with an honorable nod to Snow Crash)

Olympos - Dan Simmons

Silmarillion - Tolkein

Lion of Macedon - David Gemmell (centers on Parmenion rather than Phil or Alex)

2001 - Clarke (am I the only person here who prefers the novel to the movie?)

Player of Games, Excession - Iain M. Banks

Hang on, I'm sensing a theme, time to diversify.....

Espedair Street or The Bridge - Iain Banks (both notable as Banks novels for having happy endings and not a heck of a lot of gruesomeness)

Trainspotting - Irving Welsh

Eagles Encyclopedia - Didinger

1066 and All That: A Memorable History of England, comprising all the parts you can remember, including 103 Good Things, 5 Bad Kings and 2 Genuine Dates- Sellar and Yeatman

Notes from a small island - Bill Bryson (best. UK. travelogue. ever.)

OK, back to the theme...

Colour of Magic/Interesting Times/Carpe Jugulum/The Truth/Fifth Elephant/Strata - Pratchett (nod to Wee Free Men for truly breathing life into the Nac Mac Feegle)

Greek Myths, I Clavdivs - Graves

And at least two more that are hovering just over the edge of my brains horizon, too far to see, and it's going to bug me all day....