Personalization: User-specified favorite posts/pages

Suggestion: For content-heavy sites (in our case, lots of educational "how-to" type articles), a plugin allowing users to personalize some navigation by selecting particular articles/pages as "favorites" and have that list available in an area on the home page (once logged in) or in a sidebar would be a great way for individual members/users to get to favorite content faster - without having to drill through what could be many navigation layers. Sort of a "playlist" for posts...