You must build JBoss Blog artifacts from source code, because of this project is now in refactoring process to allow a simple artifact deployment.
It doesn't exists any binaries distribution, you must build by yourself JBoss Blog binaries.

Today I have updated JBoss Blog pages on JBoss Community Wiki, you can follow instructions published here:
http://www.jboss.org/community/wiki/JBossBlog

Hope this helps.