Useful for a multi-lingual site - display cloud 1 for English, cloud 2 for French, etc.

The user-side tag form would have a parameter to submit entries to cloud 1 or cloud 2.

I have the rest of a site that uses Tag bilingualized, and this would rock.

Or is it possible now, some how?

No.... one of the shortfalls of Tag is that it’s one big cluster of Tags… it’s not per weblog or anything, which would be the only way I could see such being possible
I will add this to the list