This looks really promising, actually signed up which is saying something because I've always leaned towards just using actual websites despite having built a few mobile RSS readers myself.

I am a bit confused with some UI elements though (perhaps because I wasn't a heavy Google Reader user):

1) Subscriptions are for grouping feeds ya? I see how I can create a new subscription and name it, but I'm totally failing on how to add a feed to it. If you go to the RSS page I see things I want to add, but no plus button or other interaction seems to do what I expect. Am I just confused?

2) Not sure if this is a setting somewhere, but having full articles open in a new tab would be nice.

3) Is there a way to set all the items in a single subscription as read?

4) What is the column on the right? Popular items? Some label there might be good.

Overall super cool, I like it! Keep it up man. If you continue developing it, consider a Bitcoin tip jar, I'd throw some your way.