Nice tips everyone!
Here's mine: I find it extremely comfortable using the hot corners. Go to System prefs / Dashboard & Expose. Set the lower left corner to "All windows" and the Upper right to "Desktop". Now you can switch applications by moving your mouse quickly to the lower left corner and selecting the desired window. Once you get used to do it quickly, you'll find yourself trying to do the same thing in Windows.
You can also drag and drop files easily that way. For example, you are writing an email. The window covers much of your desktop. Go to top-right corner (reveals desktop) start dragging a file from the desktop, go again to the top right still dragging (all windows appear again). Drop the file into your e-mail window.
You can even go to the lower left corner dragging a file, when Expose shows all the windows, put the cursor over a window and wait for it to appear, then, drag the file.
Does anyone know a way to make finder sort the folders first? As Explorer does?
Thanks!
20 Useful OS X Tips