Google Blog Converter
Data Liberation Team from Google released Google Blog Converters in Google Open source project. Google Blog Converters allows you to convert between export formats of Blogger, WordPress, LiveJournal and Movable Type. Library and scripts are written in Python language and following sample are hosted on Google App Engine.
You should notice that there is a limit size of a downloadable file on these Google Apps is just 1MB and can be used for small blog export files.