I saw your question about "claiming" your site. I am not using wp.com (we're on wp.org), but you should be able to add the meta tag. I could be talking out of my ass, though. I like to think I'm tech-saavy, but I really know just enough to screw our site up once in awhile (much to Kent's dismay)!
You're right C, you need to add the meta tag, but it needs to be on the homepage after your head tag, and with wp.com blogs I can't see any way to edit the homepage code. I tried adding it with a widget on the sidebar and putting the code in there but it didn't work. I think I'll have to give up on claiming it until I transfer over to wp.org.
Others might like to know that if you set your blog up with an email address corresponding to yr domain name you can claim that way too. Prob bit easier that way if you're a techno dunce like me!
You need to upload that .txt file (via ftp) to your root directory. If that sounds like a foreign language (you would not be alone, trust me!) you can have another option. What blogging platform are you using (wordpress, blogger, etc)?