Interesting. I'd never heard the term "Casual Newsreader", but Googling for it, it seems like an Australian term or something like that.

To me, that term makes me think of using the Agent newsreader on Usenet in the 1990's. It was great at letting me "casually" read usenet and scroll through all my subscribed forums with the space bar, and I had shortcuts that let me easily ignore certain threads and cross posts. It was so very casual. :-)