Thumblogger is the common alternative for blogger, it currently exists for over 1,5 years and many webmasters are using it.
http://www.thumblogger.com/
has all the features a adult blog webmaster could wish for. But use the search engines on the boards to find out more about thumblogger.
You might also want to take a look at 6 tools for the adult blog webmaster:
http://www.adultblogwebmaster.com/tools/