I cut the following from another thread.

Can one of you old hands give us newcomers a bit of background about what is
going to happen in 10.0.

Will the XF86config file I have now not work in 10.0? No big deal, just
wondering. I'm confused as to which kind of "X" I'm using in 9.1.

I researched http://www.x.org/XOrg_background.html but it doesn't say much.

How about a little history, please.

Al


....
x/: Switched to X11R6.7.0 from X.Org. Thanks to those who sent comments to
x@slackware.com. Seems the community has spoken, because the opinions were
more than 4 to 1 in favor of using the X.Org release as the default version
of X. I think I've heard just about every side to this issue now, and it was
only after careful consideration and testing that this decision was made.
It's primarily (as is usual around here) a technical decision. Nearly
everyone else is going with X.Org and it seems to me that sticking with
XFree86 it spite of this would be asking for compatibility trouble (indeed,
we saw some issues between X.Org and XFree86 4.4.0 until a few things in
XFree86 were patched). I also noticed that the ATI Radeon binary drivers
designed for XFree86 4.3.0 do not work with XFree86 4.4.0, but do work with
the X.Org release. Something I'm not in favor of is dragging around two
nearly identical projects, so XFree86 4.4.0 has been moved to the
/pub/slackware/unsupported/ directory on the FTP site.