Thanks for the chart. It lays out comparisons nicely. You can also see a similar chart at http://www.xvsxp.com/finalscore/index.php
Well, first of all, FileVault and Windows Firewall have two completely different purposes. Mac OS X has a built in firewall btw.
As for AppleScript, Windows has some scripting technologies, collectively referred to as Windows Script Host
OpenGL does work on Windows.
Windows does ship with speech technology similar to VoiceOver, it's called Narrator (Start -> Run -> "narrator").
If you want a complete UNIX-like environment on Windows (commands, compilers, daemons, X, etc), use Cygwin
is similar to Xgrid.
is a free substitute web page editor.
Of course, Media Player Classic can decode H.264 as well.