I'm a huge fan of @Flipboard for my iPad, and I finally checked our Paper.li for the first time after learning about it at a workshop this past summer. It's a very easy tool to use. You simply connect your Twitter account with Paper.li's login system and you can choose what types of "newspapers" you want to create. You can set up different pages for different lists or tags, or you can just have all your feeds come into one page.
It's not as pretty as Flipboard, but I really like how it organizes the Tweets by theme (as best as it can). Unfortunately, the ads really take away from the aesthetic appeal.
Header photo by Robert S. Donovan