How about typeahead for tags?

I'm a large fan of Sandy's "New" item entry popup gizmo. Email's good, but sometimes it's just a pain.

When I'm entering something, say

r Go get a cup of coffee in 20 minutes. @coffee @break @zentime

When adding tags, I'd love it if Sandy would ping my set of tags that already exist as I type them, and suggest existing ones - think google suggest or remember-the-milk tag entry.

Thanks Sandy!