Tagging Suggest

Ok, I got woken up at 4:30 am on Saturday morning and all I could think about was tagging. How sad am I?

I was thinking about the problem of multiple tags for similar words and I've come up with another idea:

Could systems that use tags utilise AJAX technology to suggest a bunch of tags as you type in a way similar to Google's Suggest?

The advantage of this would be that the system may suggest Black and White, instead of a user typing Black & White.

I admit that this wouldn't work with B&W unless the system also had semantic links as I explained earlier.