Has anybody looked at using YUI Editor? It has a lot of desirable features that people here have been asking for:
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Icons
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Calendar.
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Plugins.
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Skinning via css.
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Code formatting.
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Image upload. (plugin)
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Easily configurable toolbar.
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Display in popup window.
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Plain Text/Rich Text toggle making it also suitable for comments.
Using YUI Editor would require loading another framework, but this could be done only on the question page.