By default, Windows Explorer opens up in the "My Documents" folder, which is far from useful (assuming you don't store all your documents there). Just today, I figured out how to get Windows Explorer to open in a folder that you specify. Here's how to do it:

1. Right click the Windows Explorer shortcut and select Properties.
2. Make sure you are on the "Shortcut" tab.
3. Clear the Start in: field. Contrary to what you might think, Windows Explorer seems to ignore whatever you type here (which seems stupid to me).
4. Change the Target: field to the following:
   %SystemRoot%\explorer.exe /n,/e,{Desired_Path}. For example: %SystemRoot%\explorer.exe /n,/e,C:\. Note that the commas are required!
5. Accept your changes.

Now, each time you open Windows Explorer, it will point to your desired location. This is an incredibly useful tip that will now save me two clicks for every explorer window that I open!