Originated from links to related tags
May be helpful: A real solution to ambiguous tags
It would be pretty nice to have a sort of 'tag suggestions' feature. Sort of like the Gmail labs feature "Don't forget Bob!".
Normally, when tagging stuff, most of the time you don't even know if a tag exists. Typing segments of various related topics and waiting for a tag to appear is annoying. You don't want to create a bunch of tags either.
So basically I propose that the system should look for tags which are often used in conjunction with the tags which hav already been entered, as well as look for commonly used tags in the "related questions" titlebox dropdown.
Possibly we could also have a way for users to enter related tags (a section of the tagwiki perhaps), that the system could utilise for this feature.