This is more a suggestion than a question, though answers and comments are welcome. In question What should the tag wikis contain?, Robin suggests the preferred content for tag wikis. Unfortunately, ...
Updated version (March 20, 2011): Use this tag if: well-known open problems: the problem is equivalent to a well-known open problem in the literature community open problems: the ...
I just edited some tag wikis to explain what the tag was for. I did it for tags like pcp and qma where it may not be clear what the acronyms stand for. So for example, for QMA, I explained what it ...