Here is my advice. I understand you may not have a budget, but you can get a self hosted Wordpress sintall for about $7-$9 a month. If you want to go free, you still pay. How? With your TIME. If you have more time than money then by all means, enjoy the frustration. I've moved many people from Wordpress.com because its slow, and people get tired of hearing all the cool things other people are doing, but they can't. You can get media hosting for$12. What gets me is people won't put out $20 a month for a podcasting hobby, but they'll blow $50 to see one movie, or $39 for a video game, or $20 for 4 cups of Starbucks in a month.
Make sure you are linking to only one item. Feedburner (if you have it set to do this) will make enclosures for all media.