i have a free blog on wordpress.
been doing it since December 2009. works well. don't know about the others you mention.
mine discusses astrology, intuition, spirituality, practicality, metaphysics, philosophy.
lots of astrology blogs out there.
mine:
http://cosmictuesdays.wordpress.com
i belong to a private astrology bloggers group on Facebook. we have 147 members.
PM me if you like.