go to wp-admin/index.php
comment out these line.
//var update2 = new Ajax.Updater( 'devnews', 'index-extra.php?jax=devnews' );
//var update3 = new Ajax.Updater( 'planetnews', 'index-extra.php?jax=planetnews' );
deactivate all those plugin.. and re-activate back.
test one by one.. to see which one had broken.
sometime the uploader thing also break..