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Apache 2 (and HTTP in general) has another perfectly-suited mechanism for changing the Content-Type header, though. Apache will take all the Accept: headers sent by the client, choose an alternative from all the options listed in the document.html.var file in the directory, and serve that to the client. Look into mod_negotiate, not mod_rewrite. (But note that at least IE6/Win's Accept: header has */* listed with no priority, whereas at least Firefox has */* listed at a much lower priority. So your .var file has to give text/html a 1.0 preference, and application/xhtml+xml a 0.99 preference or so.)
Yes, it is one more round-trip (I think), but I haven't seen too many problems with it, even on a slow upstream connection (web server on ADSL).
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