Why won't this feed render properly?

Hi,

I'm writing an RSS feed using PHP. It validates OK, but won't render well. All I see is plain text. The url is http://www.dawjee.com/kat2/rss.

When I look at a feed from google, it looks well rendered. e.g. http://news.google.co.uk/news?hl=en&rlz=1T4GFRC_enGB203GB204&q=xmlns&um=1&ie=UTF-8&tab=wn&output=rss

How can I make my feed look like google's?

I tried modifying the header with:

header("Content-Type: application/rss+xml; charset=UTF-8");

But that didn't work.