No Objects Visible In Object Index

I’m trying to use the bilateral blur effect to speed up my render. I thought I’d try to use the anti-aliased object data from ID Mask to clean up the edges of the objects, but I can’t get any object data. I must be missing something, but I don’t know what. Can you help? This thing will take a month or more to render on my computer if I can’t find a shortcut.

Here’s the blend:
http://www.pasteall.org/blend/19732

Well,

The passes seem to be working now, but they’re still leaving artifacts at the edges of the extruded text. Any ideas on how to clean them up?

The index passes are not anti-aliased. Your only chance at cleaning up the edges are compositing magic, like the AA option in the ID mask you already tested, or trying to achieve the same effect manually (dilate, blur etc)