De-Indexing? Is There Such a Thing?

A strange thing has happened. A couple of days after creating this blog, I checked and was happy to see that it had already been picked up by google. The blog was indexed pretty quickly.

Today I checked again (don't know why I did actually) and it was no where to be seen in Google!

This is not the first time I have seen it. It happened to a Squidoo Lens of mine once. The lens was indexed by google. Then it disappeared. And then it was indexed again!

I wonder if anyone else has seen that?