Some people just won't give it up -- their domain names, that is. People are just sitting on some of the coolest blog names at blogspot.com, and there's nothing an enterprising, fresh new blogger can do to shake them loose.
Here's an email from Blogger Help:
This blog looks abandoned, can I have its address?
Blogger accounts and Blog*Spot addresses do not expire. Therefore, we can't take away somebody's blog address to give to you. Occasionally people come back to their blogs after long absences, and we want them to be able to find their blog as they left it. If you find some contact information on the blog, you are welcome to deal with the owner directly, to see if they are willing to delete the blog so you can use the address. However, we do not give out contact information for the owner of a blog.