This from D. N. Arnold, SIAM NEWS, December 4, 2009 (via my friend Gregor)
Integrity Under Attack: The State of Scholarly Publishing
Pay no heed to silly numbers - just check what journal the good publications that you have read are, publish there. Even that can be gamed and is, in good journals like Physical Review Letters; once you establish a little subfield, with a group of friends citing and refereeing each other, it can have a good run with not very good articles. There is no defense other than common sense.