With offline storage it can work much like offline gmail using Gears on the desktop. That's more or less the point.
Google around for HTML5 and offline storage.
Google around for HTML5 and offline storage.
With the requisite warnings about "no connection present" duly dismissed (this is an iPod Touch 2.0, so no AT&T network backstopping it either), I can browse my GMail inbox, read messages, make changes, and perform seemingly any "normal" mail function all without a connection. Obviously will have to connect at some point for it to be useful, but can do everything but send/receive new messages while away from a network connection.