There are over 500 questions tagged with wordpress-x version numbers. Out of all those questions there are maybe 5 or 6 actually related to something version number specific.
They just need to be banned.
In 6 months from now when the current version is 3.2.1 is anybody going to care about something tagged 3.0.1 or 3.0.3 especially when the questions have nothing to do about the version and were only chosen because it popped up when the asker started typing wor......
There are only 2 stackexchange sites (not in beta) based on an open source software project. Us and Ask Ubuntu and the version tags they use are just the numbers like 10.10. Plus Linux distro version changes are very significant. WordPress version changes rarely bring major change.