Lightroom.

A friend of mine pointed me in the direction of a Trial dowanload of aperture on the apple site. So I D/Ld it, installed it, imported 3000+ pics in it (took two hours) and after half a day sat there processing thumbnails and previews I played with it for just about five minutes and then chucked it off the hard drive.

Lightroom has the tools intuitively set in your face and there isn't really much need to go through manuals.

Aperture - I couldn't find the blooming tools to start with. And when I did, they weren't as easy to use.

So, Lightroom wins with miles to spare.

/E