A little applescript to append text to a specific file (so it's not really a replacement for the QS command).

I don't think anyone will ever beat the good old Bezel interface. This one emulates Cover Flow, adding a bit of prettiness but making QS more distracting, harder to use.

Works well.

Nice tutorial - I've been tagging my files this way for a good while, but still picked up a few pointers.

A nice-looking cube interface for QS (requires a build that I don't seem to be able to get, though).

"You can now create mouse gestures to do anything Quicksilver can do using a plugin called Abracadabra."

A triggers-centric tutorial on using Quicksilver. (I set up a lot of triggers when the feature first appeared, but tend not to use them much - it feels more 'natural' to me to use the QS interface, if a teensy bit slower).

Get Atom Actions plugin/module here.

An intermediate tutorial.