It's not really about "forgetting". In many cases, a simple desktop app won't cut it.

Unless it also has a mobile app that syncs what I've read with the desktop app, it's sub-par to Google Reader for me personally. This is actually the most important of any feature for me.

I need to be able to go back and forth between desktop, laptop, and phone and never lose my place. I travel, co-work periodically, and like to read my feeds over lunch on most days.