So, do I believe in the Hollow Earth?
No. I picked This Hollow Earth as a blog name because I thought it sounded funny. I thought I picked a conspiracy theory that was so far out that nobody took it seriously. I was wrong. There are plenty of web pages out there that appear to be completely serious about it. I have a suspicion that some of them are jokes. Exercises in critical thinking. But, most of them do appear to be legitimate.
Then, What Are You?
I am a Skeptic (of the James Randi/Martin Gardner variety), and an Atheist (which I see to be merely an extension of critical thinking).