RSS feeds with XSL stylesheets

[#1]

I have been trying in vain to persuade an XML RSS feed of mine to use XSL for a bit of tarting up. I have extracted the gist of what I am trying to do into two test files (below). Can anyone (including the PN blog developers who must be familiar with this!) spot what I am doing wrong please?
Feed file: http://www.decomplexity.com/testnewsfeed.xml
Stylesheet: http://www.decomplexity.com/testnewsfeed.xsl
The feed appears to completely ignore the existence of the stylesheet.
Note that the colour scheme is purely for illustration!

[#2]

It seems to work for me with xsltproc at the command line if I feed it the XSL and the XML file. It's been a while since I used it in a browser though.

[#3]

I wonder if it's not working because browsers are picking it up as RSS feeds and most now do some fancy processing on it?
http://ccgi.csogilvie.plus.com/uni/tut4.xml for example, appears to work.

[#4]

Tnks Colin. I had assumed (perhaps wrongly) that the RSS feed formatters in common browsers would allow XSL overriding.
In both IE7 and FFox 2, the example you gave just listed the text with no formatting whatever (IE didn't even insert CR/LFs; Messrs Mozilla are more considerate...); my Attensa feedreader came up with 'XML parsing problem'...

[#5]

Mine isn't an RSS feed, it's something I randomly wrote for a Tutorial at Uni about 3 years ago, and the XSL is set to just export it as text rather than HTML.

[#6]

After a lot of ferretting around on MSDN and Moz blogs, I appear to have answered my own question: IE7 and Firefox 2 DO NOT SUPPORT user XSL stylesheets! And apparently both are sources of contention witin the world of feed developers.
There exist feed kludges to get around this but these merely prevent the browsers from recognising the .xml as an RSS feed entirely, and do not permit sensible overrides to the browsers' own internal RSS style sheets. 
Well well!

[#7]

Quote from: decomplexity

IE7 and Firefox 2 DO NOT SUPPORT user XSL stylesheets!

I'm assuming only in the case of RSS feeds, as they quite clearly support it for non-RSS feeds?

[#8]

Yes Colin - just for RSS feeds.
Firefox 2 can be persuaded to ignore the <rss> tag if a 512 (or greater) byte string (e.g. of comment) is included before the tag. Any linked.xls is then applied correctly and FFox's default RSS layout is bypassed.
IE7 is more of  mystery. MSoft's own IE development blogs say that this 512 byte kludge should work for IE7 also - but it doesn't. One needs to suppress the <rss> and </rss> tags entirely.