Expanding on this, I read online that the W3C "strongly recommends" that XHTML 1.1 is served as "application/xhtml+xml". XHTML 1.0 "may" be text/html or application/xhtml+xml. It seems XHTML 2.0 must
be served as application/xhtml+xml (when it comes out). The problem with application/xhtml+xml is, I've heard, that Internet Explorer doesn't know what to do with application/xhtml+xml, and instead of displaying it, tries to download it; not a problem for me (I said goodbye (and good riddance) to IE long ago :-) ) but with all the IE users out there, I'd be seriously thinning the amount of users coming to my website.
Can anyone confirm this or add to it?