We have implemented a GoogleReader-like mobile API that allows anyone to create a mobile app working with The Old Reader. The API is documented in a separate github repository. Please drop us a note if you create an app that works with The Old Reader.
Please note that apps use password authentication, so you should configure yourself a password on the Settings page before using any of the apps.
Drag any of this to your bookmarks
Set up and use advanced bookmarklets
There is a number of browser extensions that make tracking your unread items easier.