I read on TechCrunch that some people are not happy with Google's nomenclature regarding "tags" or "labels". Personally, I prefer to call them "keywords". I've always considered the word "tag" an action verb.
I use the word "tag" everyday. But in this way: "I tagged that photo with these keywords."
I don't think this is a serious issue, nor is it one that needs to be debated a ton since people generally understand that "tags" and "keywords" are the same thing. However, I have yet to use or understand Google's use of "label".
[tags]google, techcrunch, nomenclature, label, tag, keyword[/tags]