Response Source,
the UK PR newswire, has improved its RSS feeds so that journalists can
now subscribe based on subject category and keyword. I haven't had a
chance to explore it yet but both the news release and the email I
received from Daryl Wilcox, CEO of Response Source, make it sound good.
Disclaimer - My company
Bruce Marshall Associates PR is a big fan of Response Source and use its newswires, journalist leads emails and media database.