When newcomers ask questions about delphi they usually specify no more details. They hardly read the Smart Questions essay and such. However frequently their question is specific to their Delphi version. Either because they describe a version-specific bug, or because the answer should only use features present in the poster's version and such. It also may make search easier for those answering whose experience is with different versions.
I remember the FIDO forum on Delphi, where specifying the version in the header (or explicitly specifying the question being generic for all versions) was mandatory.
Proposal: tags like delphi can have a list of derived tags like delphi-2006 and such. Then if some new question goes with the former but with none of the latter ones, the SO engine would pop-up a confirmation dialog, asking the user to either specify his version or explicitly claim his question being generic enough to apply to any version.
I believe such a feature would be useful not only for Delphi but for all other semantically connected tags.
PS. This question had "Tags asking for tags" title initially. I still think that was a better name. If someone wants SO to ask for tags - those would be the words he would use for searching. Now this topic is again missed in search results: http://meta.stackoverflow.com/search?q=ask+tag