I just noticed that NFL.com is passing out a Title: header in their http responses. I haven't seen anything in the spec about it. Is it a valid header? It seems strange to me that you would want your web server inspecting your pages for titles, but it's feasible with mod_perl, epsecially if you can come up with a name based on a simple convention.
I've not come across this one - perhaps it is useful for non-HTML pages like Word, PDF or images? Make SEO easier for those items. I've recently discovered "Window-Target: _top" header, which has the same effect as TARGET in a HREF. Another example of HTML tags sneaking into HTTP headers... Cryo.