Can the interface for searching with tags be improved?

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To me, the visual cues when I'm searching with tags are pretty weak or conflicting. Here are some examples of what I mean:

• When I search for a word, I see that word in the box at the top of my search results, when I search for a tag, the tag names are displayed lower down, in the part I (and maybe others) usually skip between the search box and the list of results.

• When searching with tags, the tag names are printed, but they're not displayed as "tags" the way they are elsewhere on the site.

Suggestions: maybe parse the search text so that "tag:word" in the search box searches for the tag named "word", and use this to indicate to the user when a tag is being searched for. Or instead, maybe display the tags that are being searched immediately below the search box, maybe a little bigger than usual (if that's easy), and maybe with little "x"'s near them so they can be individually excluded from search too.

Ok; sorry for the rambling, not-totally-explained question/suggestion; Let me know if I should try to clarify.