Google Voice Search on Android

An feature of my G1 that I somehow did not notice until yesterday is a build-in voice search. Please notice the microfone icon next to the Google input box:

If I touch that icon I can speak a search term into the G1's microfon:

The recorded sound is then send to a Google server, I guess.

And the result presented to me. The next image shows the result after I tried to search for "Deutsche Telekom"... Hm! (This is not faked by me)

Other things work better:


Has somebody implemented speaker verification for the G1? This would be soo natural to use the mobile's microfon to verify the user!