Microsoft's Tag Scanner App. is one of the best I have seen, and is available for BlackBerry, Android, iPhone, and of course Windows Phone 7.
Their software to make the tags leaves a lot to be desired however.
Can anyone out there recommend some good and preferrably free tag software.
After many trials and some errors, trying to make customized QR codes, I contacted Microsoft QRC support. They not only answered my question, but sent me the full 13 page manual (vs the 7 page one on the web site) on how to do all of this.
Thank You Microsoft.
I have sved the Microsoft Tag Implementation Guide here.