any webiste available for posting ruby on rails articles

Normally in the rails community it's published in blogs (our own
blogs). It's highly recommended that you start one...this way if the
article is good the rails envy guys (http://www.railsenvy.com/) will
track you and talk about it in their podcast (which will spread the
word through the rails world).

Also there's this new magazine (http://www.therubyist.com/) that's
calling for papers...