Since noone will think a 20Mb AS is credible, marketing will add stuff until it reaches ~250Mb sometimes before the final release ;-)
There are still stuff missing from it (features and their libs, admin consoles etc)
Thanks Nick for the updates.
What is the best version to use Grails based apps on JBoss?
Which version is more stable can be used for developing apps based on Java EE 6?
JBoss AS 6.0.0.Final is what you can use.