Browser Support for XHTML Strict

What browser versions support XHTML Strict. My site (http://www.landjob.com) is targeted at XHTML Transitional (though the validator is helpfully telling me I’ve got a couple of issues); I’m wondering if there are browser rendering optimizations under XHTML Strict. I don’t want to walk away from too many browser clients though!
 
Thanks for any pointers to info,
Jason C
http://www.landjob.com
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