HI: I have a client who would like to offer a mashable RSS feed as a "free service" through their blog. This client is a professional service provider catering to small & medium sized business owners. Their primary referral base is composed of lawyers & accountants. My client wants to offer a very easy and customizable RSS Feed "mashup" that a registered user (of their blog) can create and manage. The RSS sources are from existing business & news websites which are attractive to this...