Other : Just mine... a special software developped with Python/Django/Celery and that works fine. The architectures is not proper for a huge loading but for me it is sufficient.
I have implemented a Google-Reader like appearence (navigation in the left, list of posts in the right) but have added some UI that was missing to me in GR (tags and subscription are not in the same place, hierarchical tags, not just one star but five to a better evaluation, a right panel that appears to show the post,...).
My purpose wasn't only to follow posts but to organize them so that I can't find them quickly and logicaly later when needed. Several things could be improved but the critical path and emergency to import my GR data before the 1st july are passed and worked fine.
Now I just know that if something very important needs to be improved I can work on it as I want :-)