Hide an Icon in the Dock

The update makes no sense. Who cares if Dockless is Universal or not? It's not like you have to run it all the time: you launch it, configure it, relaunch the applications you've fiddled with, and close it.

Dockless is *the way* to do this.

Also, Dockless doesn't lose the menus if you have a non-Dock way of switching to the app; I use it mostly on things that have menulets that I don't want taking up space both places (Aurora, last.fm), so I can still get to the menu items thru the menulet icon.
It's really a much better way of doing this and has been around for a while, I'm kinda disappointed TUAW didn't know about it or report it.

That's funny, I never realized it was a universal thing. Users of iPulse might be familiar with the key in question. The iPulse readme document has explained how to do this for years.

or use dockless, as the very first poster said.
seriously. With dockless, theres no opportunity to lose the app, because you can always find it again with dockless, and theres no need for mucking about with activity monitor or the terminal or whatever, cos its just in the dockless application.
simple.

Great tip!
I always hated having the HardwareGrowler icon in the dock as I never actually had to click it (since the program itself has nothing to be configured nor does it require any user interaction).

Just to note, though, that doing this will also keep that app's menus in the menu bar from being shown.

Another way of doing this is detailed here: http://www.macosxhints.com/article.php?story=20050819232526710

You basically freeze the running application (with kill -STOP), drag it's icon out of the Dock, quit and restart the Dock, and then unfreeze the app. It remains out of the Dock and app switcher until you restart the Dock or the app again, but it's still accessible with Quicksilver.

Sorry, there was supposed to be a link there, didn't realize HTML wasn't supported:
http://homepage.mac.com/fahrenba/programs/dockless/dockless.html

Or use Dockless.