is it either possible to filter the newsfeed or better still find a service which could provide some kind of aggregated newsfeeds on the exact subject i wanted.
I've been doing some research on this myself. In my chosen topic area there are no targeted RSS data feeds. The only hope I have is subscribing to a generic source and while they offer some filtering, it's still too wide-open for my liking. So - I'm building my own RSS feed structure and working on the top organizations that produce the news I want and getting them to implement my code. I get the news feeds I want and they have the code to give to other websites interested in this particular topic area. :)
This may not apply in your situation but it's something to think about.
there is a lot of development going on in this area. I belive that the term would be "aggregated feeds" (DO a search on google, - it might still return relevant results!) There are some programs you can use, but its only recently that it seems people have been working on feeds that can select from a set of feeds by subject or keyword. There are some ecellent resources on the web and some news services offering aggregated feeds from a set of feeds on keyword searches. Stick mail me if you want the URL's as i cant post them here.