I need a quick/dirty auction site to put up on my own webserver. Does not need to be fancy - just registered users with email authentication, only the admin needs to list items.

Using trademe/ebay/sellmefree etc is NOT an option.

Any ideas?

It seems that while there is boatloads of open source solutions for nearly every task on the planet, auction software is a seedy back-alley in the world of software.

Basically I need to run some (relatively) private auctions, that the whole world won't be stumbling across.