FreeBSD 9.1-RELEASE has just been tagged! It has not yet been officially announced, but if you can’t wait for that you can try FreeBSD 9.1-RELEASE now!
To update your source with subversion:
# mv /usr/src /usr/src.old
# svn co svn://svn.freebsd.org/base/release/9.1.0 /usr/src
To build and install 9.1-RELEASE:
# mergemaster -p
# cd /usr/src
# make buildworld
# make buildkernel
# make installkernel
# reboot
# cd /usr/src
# make installworld
# mergemaster -iU
# reboot
make delete-old
make delete-old-libs
и там где была 8-ка portmaster -D -a -f