Updating the ports from STABLE to CURRENT

Hi.

I thought of trying out the bleeding edge and hoped my knowledge of
BSD is high enough to handle it without any major problems.

But: I installed FreeBSD-6.1 with the provided ISO  package available
on freebsd.org. Some packages were installed via pkg_add. After one
week, the technician of the German telecommunication firm managed to
visit me and put his finger on the cables in the cellar. Well, I
thought of upgrading some packages with the ports-subsystem. It was
pretty easy and nice. But then I wanted more and installed CURRENT
from the CVS-source. Some buildworlds and kernel configuration later,
I had a 7.0 Current. Ok, after a startx I got some error that libXmmu
cannot be found. Ok, so I tried to recompile xorg-libraries. Ok, but
there were lots of broken packages due to a filesystem breakdown after
a kernel panic.
Well, I tried to delete it with pkg_delete -f and it worked. Now, I am
recompiling it from the updated ports-collection.

Do I have to expect more failures and do I see an upcoming recompiling
week due to broken libraries which do not work on CURRENT? Is it more
useful to reinstall BSD from scratch and update it first?

I know, CURRENT is not for productive use but I need something to put
my fingers on. Maybe I will learn.

Is there a command to recompile, deinstall and reinstall every
installed package from the ports-system? If not, it will be hell.

Bartek