In retrospect of this massive cleanup operation, I would like to ask the community how they feel about a warning or confirmation (or just special highlighting) on new tag creation.
Everybody hates stock "are you sure?" confirmation, but a lot of tags get created by mistake (and then used ad nauseam).
For example, I think I might have created the c#-4 tag by accident. Assuming the right tag was c#-4.0, there would be two tags for c# 4.0, until they are made synonyms. With a warning, some accidental tags could be prevented.