Unknown Tag Type collection Since purchasing my Samsung Nexus S I have been bombarded by 'New Tag Collected' Tag Type 'Unknown'.

I have since learned how to turn this off, but I was wondering what these Tags are and where are they coming from?
Sounds like NFC terminology to me.  Presumably either NFC is malfunctioning or you've been in the vicinity of NFC tags that are of a type your phone doesn't recognize.

Looks like ID badges and probably some credit cards and so on could trigger this: http://forum.xda-developers.com/archive/index.php/t-989630.html