Dear friends who are better versed in such things than I:

Adobe Lightroom or Apple Aperture?

For context: I have been shooting with a DSLR in jpg mode for about 1.5 years now.  Mostly I’m looking for something that will let me (a) process a ton of photos quickly and painlessly and then upload them to flickr, and (b) let me quickly correct basic stuff like white balance problems.  The primary machine for this will be a 2006 Mac Pro.

Yes, I am inviting a modern-day emacs-vs-vi flamewar.  Fire away.