Occasionally, it appears as if not all blog owners have gotten the message, just yet. For the record, here's my statement.
FTP Publishing ended, in March 2010.
If you have a blog that is hosted externally, that you used to publish using FTP Publishing, your only option is to migrate to BlogSpot, or to Custom Domain Publishing.
If you're interested in the search engine reputation, which is the product of most well maintained blogs with any history, you'll want to carefully consider the several options for migration.
If you own a domain, and you have DNS control, then you can publish any Blogger blog to a non Blogger / Google URL, using custom domain publishing.