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Fluid is an awesome (Leopard-only) application that lets you run web pages as stand-alone apps.  I use it to run Gmail as its own application, independent of my browser.  Now, Todd Ditchendorf has added the ability to use Google Gears to enable offline usage (in web apps that support it).  Or not.  Safari (on which Fluid is based) can't use Google Gears!  This, like nothing else, may bring me back to the bosom of Remember The Milk.