The list is posted. Here are my thoughts based on their overall productivity.

West

Pau Gasol - acceptable pick.
David West - no way. slightly above average producer (but scores a lot of points).
Dirk Nowitzki - usually a given, this year he's still very good, but no all-star.
Tony Parker - one of his best seasons ever (but still not outstanding).
Chauncey Billups - absolutely.
Brandon Roy - acceptable.

East

Jameer Nelson - his best season yet.
Rashard Lewis - hmm. only acceptable as a small forward.
Paul Pierce - usually a given, having a down year though.
Joe Johnson - no way. average producer, prodigious shooter of the ball.
Chris Bosh - solid, but not exemplary, big man.
Devin Harris - best season yet.
Danny Granger - nope. see Joe Johnson. His primary problems are turnovers and poor rebounding (and average shooting efficiency).

Furthermore, the article gave mention to the following notable snubs:

East

Mo Williams - not even the most productive guard on his team (Delonte West). slightly above average producer for the same reasons as Granger.
Rajon Rondo - absolutely should have been a starter. most productive player on the Celtics so far this year. yes, i'm serious.
Ray Allen - eh. didn't deserve a spot, but he's productive.

West

Al Jefferson - he's playing just about as well as ever. very productive player, but there are others equally or more productive at his position (Gasol).
Steve Nash - has he really declined in production? looks like he has, but he's still more productive than some of the all-stars.