Wow. I consider myself fairly well-versed with macs and pc's and all this actually had me re-reading.
@steff lynn: A very simple way to get things from your mac desktop to wherever you want is to;
1. Select all the items on your desktop that you want to copy/paste. You do this by dragging your mouse over all of them, and press and hold the [control] key and click your mouse. A menu will pop up just as if you had right-clicked on a pc.
2. You can copy or cut those items with the menu that popped up.
3. As in windows, navigate to wherever you want the items to be. Once you're in that window, follow the [control] [click] method again to paste them into that window.
Some other useful advice: The finder - the little smiley faced guy at the bottom left of your screen on your dock - is like clicking the start button on windows. It gives you access to all that good stuff (documents, movies, music, etc.). Macs are very different from pc's, so don't be afraid ask on the forums. I myself know quite a bit about windows, more so than macs. I understand what it's like when you suddenly switch.
I hope all the advice here, by myself and others, helps.