You can post in the external articles section of NYC indymedia. I don't know if this is the result of an attack or if NYC Indymedia decided to block posts until they got their security issues straight. All I know is that if you try to post to NYC IMC, you get a warning message every single time saying you left the category field blank. There is one article at NYC Indymedia about New Jersey Indymedia also being hacked: http://nyc.indymedia.org/otherpress/display/919/index.php
I'm not trying to raise alarm about what are rather childish attacks. I just find these people who are doing this annoyingly persistant and am pissed I can't read the news at DC Indymedia.