It's no secret that Windows Phone 8 devices such as the Nokia Lumia 920 and HTC 8X will have NFC integration. We are now seeing that an NFC reader/writer app should be available for these Windows Phone 8 devices. The NFC Interactor was announced at the NFC Congress in Hagenberg last month and will feature not only tag analysis but also a flexible tag composer.
Not really sure what all is involved with a flexible tag composer but our guess is that you can create a NFC tag for... say... your contact information and share it with another NFC integrated phone/device. Much like we can do currently with a QR Tag or Microsoft Tag and our Bing Vision.