I hope it isn't uncouth to mention my RSS reader here: https://github.com/edavis/riverpy
It treats RSS like a newspaper instead of email. Here's a demo: http://riverpy-demo.s3.amazonaws.com/index.html
I'm biased, of course, but I think it's a pretty interesting take on what an RSS reader can be.
RSS is more active now than I ever remember it being when Google Reader was around. Really interested to see what the next few years bring.