Liferea is a news aggregator and each day allows its users to read maybe hundreds of new blog posts, news articles or podcasts. Many of those are tagged by their authors by descriptive categories. So if it know what the user likes to read most why cannot it preselect those favourite "type" of articles?
The new 1.5 code now keeps track of the absolute number of read categories. Under the "Tools" menu you can now find a new option "Attention Profile" to view the per-category count.
While this might not yet be very useful, this statistic keeping opens up the possibility for more sophisticated features. For example search folders for your most favourite categories, feed and item rating, APML exporting...
Be warned this is experimental, it might work out, it might not. It might hurt performance, or not. Also it arises ethical questions about creating user profiles. All things that still need to be thought about.
Update: Due to performance problems, the Attention Profile has been disabled for Liferea 1.6