I think tagging on this site can get out of control very fast. I propose we use the method started by Math Overflow and precede game names with their acronym followed by a dot. This helps the search when people are entering tags because some people will use the full title of a game (new-super-mario-bro-Wii) and some will just put the acronym (nsmbw).
Related to this, I really suggest we increase the tag length limit from 24 to 40 or so. I tried using the tag nsmbw.new-super-mario-bros-wii and it's too long for the system. Many games have very long names like this.