GV (Google Voice)
The GV app for the G1 and Android is a front-end for the Google Voice service. This app introduces flawless visual voicemail on your G1 in addition to advanced call routing and an astounding amount of customizations and configurations for you to field phone calls just the way you like it. You’ll need a Google Voice account first before installing the app and need to have tied your phone number to your account. You can also setup your voicemail greeting and other settings for your account (such as a do-not-disturb check box)
One other cool thing that Google Voice does is to automatically transcribe your voicemail for you. It doesn’t do a perfect job yet, but it’s good enough. So now your G1 voicemail is searchable too. It may take a while for you to get used to using Google Voice, as it involves a central clearinghouse for all your calls. By using your carriers automatic forwarding service if you don’t answer your phone, plus GV’s “do not disturb” service, you can use GV just for visual voicemail alone.
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You should check out the Motorola Droid