I took a quick look at this and I think I know what the problem is. Hjalti, the author of this blog is not quoting the urls to the mp3s. Browsers accept this but your parser must not.
Peel add songs into the queue. But a while later Peel shows a big NOT at the playlist window. If you brows the blog, the MP3s are online and still available for download.
Can you give me a link to a blog that behaves like this. If it happens with all blogs anything will do. Also it would be good to have the names of the song that don't download.
Basically as much info as possible as it will help me to reproduce this.