Poll - are there any good prequels?

[jack]

This came up in the pub last night with the scifi society -- are there any good prequels, preferably scifi/fantasy? We thought of:

Children's books where the prequal is written second out of a series: Magician's Nephew, Charmed Life.
Series written out of order, such as Hornblower, Small Gods in TP.
Retrospective prequels: Asimov's robot stories became prequels to his foundation novels, though weren't at the time.

I decided that it's because prequels generally get written when an author (or their heirs) runs out of ideas, even more so than sequels, but if that's not the case they're by no means inherantly bad.

Can you think of any others?

Comments

[cartesiandaemon.livejournal.com]

I couldn't remember any reference to Omnianism before small Gods, if there was one you must be right. But I did get the impression that it didn't immediately turn pamphlet wielding when Om manifested, but that evolved there over time; if everyone still remembered seeing that would they be so confused now?