NFC Summary

I had tried to summarize the Near field communication (NFC) type related information  in to a table. I will keep on updating this with new information as and when I get confirmed data.

Type	Memory	Android support	Future handset support	Chipset	Write protection	Comment
1		yes		Innovision Jewel tags	yes
2	46 bytes	yes	expected to be there for foreseeable future	Mifare Ultralight		They have enough data for a url, phone numberm etc.
		yes	expected to be there for foreseeable future	MIFARE Ultralight C	yes	The integrated Triple DES authentication provides an effective countermeasure against counterfeit of tickets (ticket cloning). Unique 7 bytes serial number (UID)
3			expected to be there for foreseeable future		No
4	1k-4k		expected to be there for foreseeable future	Mifare Desfire	by standard no	sold already programmed used in smart cards

References
http://en.wikipedia.org/wiki/MIFARE#MIFARE_Classic http://stackoverflow.com/questions/4417911/where-can-i-buy-nfc-tags http://stackoverflow.com/questions/5985790/looking-to-purchase-android-nfc-tags