Filtering of RSS news from a huge database

Hi guys,

I would be very interested in knowing your opinion and shall appreciate a little help concerning some functionality of RSS news feeds.

The idea is the following: my website visitors should be able to create a single database of RSS news feeds. Simply that could be a single wiki page with many RSS links. Then obviously when the link database becomes big, there will be too many news ITEMS to read. To solve this problem users could set up their own personal keywords, so that the module saves only those news items which matches the keyword.

For example, lest say my website is about technology. We create a huge database of RSS links to various online resources, websites, equipment review sites, manufacturer pages etc. Then each user must set up filtering keywords, like "mp3 player", "plasma TV review",or whatever he is interested in. Then module uses the database and looks for the news items matching the keywords and saves them for each user.

How could that be implemented?