Attention and Reading Lists
"Combining Attention.xml with my Popular Links algorithm could be a very powerful thing, methinks. Rather than waiting for my friends to tip over the laziness point to blogging about something, I could digest their shared Attention.xml files and collate the links they’ve merely read. In this way, I could build an AttentionRank for various things, and cause the cream to rise to the top in my feed reader."
Via Josh Lucas.