In Can we spellcheck our tags?, ArtOfCode brought up the fact that we had (note the past tense; Michael Kjörling took care of it) a software-recomendations tag when we really needed a software-recommendations tag. I also noticed that we had (again, past tense) a super-nova tag when we needed a supernova tag.
Those are dealt with; chances are, others are not. Use an answer on this question to bring up a tag (one tag per answer, please!) you feel needs to be renamed, whether because of spelling or another reason.