Once we're done going through this list, we should add legal to the list, not for removal but for review.
For our site to become a high quality resource of knowledge, it's important that legal answers be backed up with references and citations. If an answerer is an expert on the topic, then he/she should easily be able to find supporting information.
If we cannot commit to doing that as a community, we may need to review whether or not we should allow legal questions.
As an aside, we really need more community members involved in the moderation process for this site to succeed. If you can't edit or retag, you can flag! :)
What is a tag cleanup?
The most important aspect of the cleanup is to review the posts for quality. Removal of the tag is mostly ceremonial, since a Stack Exchange developer can simply run a query to remove the tags.
These tags no longer serve a purpose (or arguably never did serve a purpose), so we plan to remove them. But this is an opportunity to go through the questions and answers and look over them. Do they look neat, professional? Do they need some editing? Is there anything we should remove, close, reopen, etc? In essence, we use the tag removal as a sort of checklist of what posts we've reviewed and left in a good state.
While the regular community may have moved on and forgotten about these posts, they are viewed daily by visitors coming from Google. Posts that represent the kind of quality and expert level material we strive for is what will keep people coming back for more.
Note: Tag cleanups can also take the form of reviews. For instance, many answers in the legal may need some editing to back up answers with citations or references, but the tag will not be removed.
Which tags are the worst?
The area where we need the most help with the tag cleanup is the client tag. There are 73 questions. If you can retag, please help out. If you can edit to fix problems with a post, that helps too. If there's a problem you can't fix, either flag the post or create a meta discussion.
Remember, the idea is to review the content and fix problems you see. Removing the tag is sort of an auxiliary goal.
For the legal tag, there are 30 questions. We should ask if the post needs the tag, and if it does, do the answers need references? If so, we can either edit them, leave a comment, flag them for mod attention where we can either leave a comment ourselves, remove them if they're really bad, or add a "citation needed" post notice to the answer where we can come back to them later using a special filter.