Until someone has the capability to propose tag synonyms, I suggest we list them here. Over on stackoverflow, some of us began the discussion of the tag synonyms, in addition to the overall tagging scheme. Some of it resulted in a collaboratively edited document. It is far from complete, or coherent, but it can also serve as a guide post for the ongoing synonym and tagging question.
Edit by J.M.: I (or any of the other mods) will be periodically removing synonym proposals that have been settled. Please check and vote for proposed tag synonyms in the appropriate pages.