There are several proposed tags changes lingering about here on meta. I thought I'd capture them all here, each one as a separate answer, and let people vote on them. 

 - [Make `tag:sql-agent` a synonym of `sql-server-agent`.][1]
 - [Make `sqlcmd-mode` a synonym of `sqlcmd`.][2] - **completed**
 - [Rename `sql-server-2011` to `sql-server-2012`. Make `denali` a synonym of `sql-server-2012`.][3] - **completed**
 - [Merge `locking` into `locks`][4] - **completed**
 - [Delete `xmltype`][5] - **completed**
 - [Delete `columns`][6] - **completed**  made synonym of [tag:database-design]
 - [Delete `schema`][7]
 - [Delete `add-column`][8] - **completed**
 - [Delete `data-migration`][9] - **completed**
 - [Delete `database`][10] - **completed**
 - [Merge `restore` and `recover`][11] - **declined**
 - [Delete `query-help`][12] - **completed**
 - [Rename `azure` to `sql-azure`][13] - **completed**
 - [Delete `mysql-replication`][14] - **completed**
 - [Delete `pg-restore`][15] - **completed**
 - [Rename `tuning` to `query-tuning` and blacklist forcing explicit choice between this and `database-tuning`][16]
 - [Rename `sql` to `sql-language` and blacklist to prevent abuse][17]

**If you downvote a suggestion please explain why in a comment.**


  [1]: http://meta.dba.stackexchange.com/a/543/2660
  [2]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/474#474
  [3]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/456#456
  [4]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/453#453
  [5]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/435#435
  [6]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/410#410
  [7]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/409#409
  [8]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/406#406
  [9]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/388#388
  [10]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/392#392
  [11]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/386#386
  [12]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/385#385
  [13]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/384#384
  [14]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/383#383
  [15]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/387#387
  [16]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/483#483
  [17]: http://meta.dba.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/484#484