It’s understandable that you’d want to keep your personal stuff, well, personal. That being said, CNET’s mighty Topher Kessler has turned out a spiffy step-by-step guide as to how to encrypt certain parts of your Mac’s hard drive while keeping other parts open as needed using OS X’s Disk Utility and Terminal applications.
Take a gander here and if you know of any cool security tricks you’d like to share, please let us know in the comments.