Metrophile can check a favorite feed by using your Google Reader account.
Because Metrophile can read the text and the image data in feed in your iPhone/iPod Toutch, You can read without internet access such as subways.
-Get Item from your Google Reader account (max 50 item can saved/get latest 50 items).
-Offline view function (text/image)
-"Add star" and "Remove star" function (internet access required).
-Filtering function(by feed).