Some great ideas, but still missing smart deduping. This is a real pain when having master feeds and aggregators that might also include those feeds: you may see the same story on the same site multiple times as each aggregation displays it. It would be nice if a tool recognized that it's been read and marks it as read in all the aggregation feeds someone might also have in the same folder.
You're right. But this feature is also completely out-of-scope for the type of reader I'm making. Maybe one day, if I'm sitting on a pile of money and have more time than I know what to do with, I may enter into the aggregation aggregation business, but it doesn't sound fun. I think a very small percentage of users want aggregation aggregation, whereas most folks are looking to keep up to date with an ever increasing number of writers.
