The reason I do not like Google Reader much is because of the reason that it does not come as a standalone desktop app. However this is about to change with the new Adobe Air app called ReadAir.
ReadAir is an OSX Themed Desktop Client for any operating system that can run the Adobe AIR platform (Mac, Windows or even Linux). It synchronizes with your online Google Reader account to provide you the latest news and articles through RSS feeds.
This app is open-source and hosted on Google Code. The developer has promised that the app will soon feature some unique themes and keyboard shortcuts. The great feature of this app is that it retains the qualities of other apps built on the Adobe Air platform i.e. light size and simplicity.
Something tells me that FeedDemon by NewsGator (currently the most-used desktop RSS reader app) is going to get a tough competition with ReadAIR.
Linux/Ubuntu users can read our guide on How to Install Adobe AIR on Ubuntu to enjoy using this app on Linux 
Sizlopedia is a technology blog created by Saad Hamid, a problogger from Pakistan.
I like Google Reader because of its on website and not on its own client
but opinions can differ 
Thanks for the heads up. I have been using GReader with Mozilla Prism just for the same reason that I wanted it as a Desktop Reader as well. This one looks very cool but with Adobe Air in Linux, I don’t get a login to put my username/password. Instead the AIR Introspector is popping up.
Yeh I faced the problem too. Just try closing the application and restarting it by clicking on the desktop icon. The login manager will open up behind.
The application does have minor bugs but I hope they will be fixed in the future releases.
Yep, tried that but it’s the Introspection window that pops up. Could be something on my end and will try it on my Windows machine.
Thank You Good Friend.
I have the same problem than K-IntheHouse
It doesn’t work very well (Ubuntu Hardy)
Anyway, thanks.