RSS has a long way to go.
When the large and smaller producers cant create a valid format.
Google BlogSearch
Have you noticed that google blogsearch adds html tags to the rss title tag? they wrap the found keywords in bold within the title.
This is not good practice.
using FEED Validator, google's blog search rss, and Feedster rss
are both invalid.
A feed from Flickr was also invalid.
But thankfully after around 10 large rss feed producers I found one,
Plazoo, was valid. Well done.
My feed was also invalid, Can you help me determine why? Well, the error on my feed is a warning only about UTF-8 encoding.
Finally.
No I understand that feed validator may not be perfect, and there are many "views" on what valid rss shoudl look like, but it is kind of a sad place we are sitting in.
I would like to see some more non optional elements within the rss spec, to start bringing things together.
RSS 2.1 is needed, but will it ever happen? If rss as Microsoft and others are inferring will become more of a "platform", surely we need to get a bit more consistency?
Microsoft
Now have a Web Feeds Home, but they have not put the meta tags on the home page that allows "discovery", which IE7 is now supporting.
Named and Shamed!
NetscapeNetscape is making a comeback, with digger like functions. Browser supports RSS
ISWC 2006 The 5th International Semantic Web Conference is coming up..