Differnce between Xfree and Xorg

[aroushdi]

I am a little bit confused I see here that we have moved to Xorg 
distribution . I took a look at XFree.org and it seems they have 
Binaries for Cygwin till 4.4 .
My question is Xfree going to be abandoned in favor of Xorg . What is 
the relation between the 2 . The reason I am asking because since the 
move to Xorg binaries i cannot have more than one Xsession at a time .
thks n rgds