Here’s how I’d do what I think you’re aiming for:
I’d grab the RSS feeds for searches for either “link:http://marshallk.com” (my url) or just the URL itself, in Google Blogsearch, IceRocket, Pubsub, Technorati and Search.MSN.com. That way you’ll never miss anything. Then I’d splice all those feeds together through FeedDigest.com where there’s a very simple option to remove duplicates by either title or URL. That generates you one meta-feed (if you will) that can be subscribed to in Bloglines or any other feed reader. FeedDigest also generates a javascript code snippet you can plop into your own site to automatically display your RSS feed in HTML. I do that a lot - like for my Web 2.0 definition page I just posted yesterday. http://marshallk.com/web20

That’s how I’d create an egosearch feed without duplicates, if I understand what you mean to do. I just subscribe to the various search engine feeds and put them into a folder in my feed reader (newsgator). Sorry to take up so much space!