Once idea we're looking at doing on our website is setting up some personalized RSS feeds for people, including certain items they choose, and the types of products they have purchased in the past. There are some items that we sell on our website, but that we cannot advertise - that is, they cannot show up on a Google or Yahoo search result. We would like to include some of these items in the personalized RSS feeds, but I see a potential issue.
If a user subscribes to their feed through My Yahoo!, Bloglines, or some other service, these sites will grab the actual feed, and then serve it to the user. This is fine. But, at least with Yahoo, those feeds are automatically put in their database. Then some other person could search for BrandX, find the feed, and publish it in their blog. If it's a really good deal, and the feed becomes popular, then that product has the potential to rank in the SE. Is there anyway to tell Yahoo, et al, that they can retrieve this feed, but don't allow it to show up in a search?
Disclaimer: I know, highly theoretical and unlikely situation, but it's something that has to be considered.