Need keep webpages for later reading ? Laterloop is running on Google App Engine has a clean design and cannot be easier to use:

• Login : Create your Laterloop account or simply login using your Gmail account.
• Quick Access : Download the plugin for Firefox
• Save for Later : Drag & Drop the bookmarklet to your bookmark toolbar
• Read while on the move : Visit Laterloop page optimized for mobile browsing
  

Do you already use similar application ? Which one ?