I think he meant as in cut or move documents in finder to paste/move them to a different folder.
As far as I know you cant cut files in finder. I really miss that ability since I used it all the times in windows. I hope that Leopard includes it (although I have not heard anything about that).
Command - c, followed by Command - Delete.
I think the idea is that, unlike text, you can lose important information that has no backup,l and do so very quickly, andpossibly without knowing it.
You could cut a file, and lose it very easily as it doesn't actually go to the trash, it goes into a "void" and if you copy/cut over it, you lose it.
I know people who have a hard enough time getting x c and p to work just using single words, I wouldn't want to move them over and have them use it on the file system with the ability to cut
I suppose if you are a huge keyboard junky this would be helpful. HOwever since I have Exposes keyed to one of my mouse buttons, as well as a hot corner, I can move files just with the mouse pretty easily.
Trick: Set up Expose to have a hot corner. When dragging a file you can drag it into the hot corner, which will activate Exposes. Don't let go of the file, but continue dragging to the folder you want. You can then hit the space bar and it will select the window you have highlighted and bring it to the front. Now let go of the file, and vwalla! It's moved
Or if you have a multi button mouse (mine is a 5) you can hav eone of the other buttons activate Expose. YOu can click and drag, and give it an exposes click mid drag. Use staps above, except instead of the space bar, you can use the same button you used to activate expose.
Or, just use your windows method, and add Command-Delete to your key sequence
-A (otherwise known as Command-A). The 
