Legend shown next to tags indicating meaning of colors (or at least tool tip bubbles)
Colors are nice, indication of what they mean would be helpful.
Filtering of types/colors would be nice.
When user selects a tag, text entered to that point should be replaced by that tag.
Typing more text should always reduce list of tags, sometimes it seems to grow (and rather than or).
Shorter tags should sort ahead of longer ones.
Michal shared this idea