In wordpress admin under options>reading select full text. This is for your own feed, nothing you can do about other feeds that are not full text.
feedwordpress can only pull what's in the feed, if it's decription only feeds, then you are out of luck.
Take a look at
http://www.autobloggerpro.com we are planning some cool features for 2.5 that would make problems like yours a thing of the past.
YARGH!