Update: This is an older post that has a lot to do with the previous about cloaking. I've written it when I had less then 50 readers:) Now it's a good time to resurrect it. Read it and apply it if you're into the nasty stuff.

The meta description is very important for a website in both white hat and black hat use. But its importance is only understood when one employs cloaking and it's the last (only) line of defense against curious looks.