I don't really understand the purpose of this. How is it different from the subscribe bookmarklet provided by Google Reader?
If your application and Google's cost the same, why use yours over Google Reader?
Google is a powerful brand and it's free. What can SubToMe offer to gain users?
I understand this is open source so you're not thinking about things like market share but just a helpful thought.
Say you're a blogger. You want to allow your users to subscribe to your content. Would you only allow those who use Google Reader to do so? Certainly not! SubToMe actually plugs nicely into Google Reader for the Google Reader users as well as it plays nicely for those who use BlogLovin'... etc.
I didn't get the button from the page alone - follow seems like the wrong word for that. For me, that is a subscribe-button for a rss-feed. Which is a good thing i would like to use for my own blog, as in my eyes the browsers went crazy in removing their support for feeds. This seems very helpful.
I know it's tricky to understand, bit this button just does 'subscribe', without actually specifying to what (besides the page you're on), or using what reader/tool.
1. Add icons for the available services in addition to the names. 2. Add an "Other RSS" button that gives the user an easy way to copy and paste the feed URL into their app of choice in case it's not listed.