For my money..

The best way to look super-duper busy is to ensure the following things are up on your screen, all in overlapping windows:

• At least 1 Notepad with a stupidly huge log file in it
• Some browser window with a bunch of charts and shit in the background
• At least 1-3 DOS boxes
• Calculator running in expanded/hex mode

You'll look like a freaking genius. I don't even want to do any work, I just want to look at how productive my screens look while I blog.