This is half a question, half an announcement. I will be going through the list of tags and merging particularly bad ones (e.g. ones that aren't mathematical or are too specific) into the tag [tag-removed]. I will also be creating tag synonyms. Any suggestions for mergers or synonyms should go into this thread.
Roughly speaking, here is my general policy: if I can't imagine a person classifying a tag as either interesting or ignored, I'm getting rid of it.
Edit: This thread and the tag changes archive have been merged for simplicity.
Edit2: I've started a new summary thread. Moderators: please allow sufficient time (at least 1 day) for discussion on "non-trivial" proposals, before actual implementation (some of such "non-trivial" ones are still not yet resolved, see the list below). After implementation please first comment to indicate implementation (to get a date stamp), then delete the answer to unclutter, and add a line to the summary thread.