How are blogfolios different from e-Portfolios? They aren't exactly, they're more of a subset of e-Portfolios, or another way of looking at the traditional e-Portfolio.
Though it may seem like everything has an RSS feed nowadays, lots of sites still lack the feature. Fortunately, there's Dapper: The Data Mapper, a web service that will take information from a site and package it in the form of your choice.
Reader's friend list comes from the list of people you can chat with on Google Talk or Gmail chat. To invite friends to see your Reader shared items, simply invite them to chat. To remove them, delete them from your Gmail contacts, or from your Talk list.