Full NFC support coming to Google Nexus S in the future0
NXP, the company that produced the chip, assured that it has released a protocol stack that covers all the functionality for other handsets as well. For the time being, you would only be able to use your NFC-enabled phone as a reader in one of the many places equipped with an NFC decal in the Portland, Oregon, area, for example. You would just have to point your phone to the decal to read the Google Places page of the store/locale.
In the near future, big G plans to roll out step-by-step updates that would gradually enable two-way transmissions and we would imagine these as part of an update to Android 2.3 Gingerbread. NFC works simply by pointing your handset to the receiving device to submit a transaction, but take into account that the technology works within a 4-inch range.
source: ReadWriteWeb via IntoMobile