One thing I’ve always wanted with Google’s services (like reader, email, calendar), is the ability to use it offline… don’t we all want that?
Google’s actually already made the Reader app available offline. What you need is Google Gears. I’m pretty sure it stores scripts and data from the service on your local computer, and when you are in offline mode, it uses the stored data instead of the live data (web) to present information to you. Since Gears has the ability to support multiple services, I think Gmail, Google Docs, and Google Calendar are next.
I'm not finished with the design of my blog quite yet, please hold on while I fix the comments, archives, and search templates.