Looks like Google will be providing official support for Exchange with Android 2.0. Not sure what this means for Zimbra yet but at least this is built into the OS and not a handset OEM add-on. I'm hoping that the Zimbra developers are all over this.
Android 2.0 Platform Highlights | Android Developers Quote:
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Multiple accounts can be added to a device for email and contact synchronization, including Exchange accounts. (Handset manufacturers can choose whether to include Exchange support in their devices.)
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