Been in the tree for over a month now. No problems from what I can tell.
compiles fine for me x11-wm/openbox-3.4.6.1 USE="nls -startup-notification -xinerama" # emerge --info Portage 2.1.4.4 (default-linux/x86/2007.0, gcc-4.1.2, glibc-2.6.1-r0, 2.6.24-zen3-1337 i686) ================================================================= System uname: 2.6.24-zen3-1337 i686 AMD Athlon(tm) XP 2600+ Timestamp of tree: Sat, 15 Mar 2008 08:30:02 +0000 app-shells/bash: 3.2_p17-r1 dev-lang/python: 2.4.4-r9 dev-python/pycrypto: 2.0.1-r6 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.2.18.1-r2 sys-devel/autoconf: 2.13, 2.61-r1 sys-devel/automake: 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 1.5.26 virtual/os-headers: 2.6.23-r3 ACCEPT_KEYWORDS="x86" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=i686 -pipe" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/config" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/ /etc/php/cli-php5/ext-active/ /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c /etc/udev/rules.d" CXXFLAGS="-O2 -march=i686 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="collision-protect distlocks metadata-transfer parallel-fetch prelink sandbox sfperms strict test unmerge-orphans userfetch" GENTOO_MIRRORS="http://gentoo.prz.rzeszow.pl ftp://pandemonium.tiscali.de/pub/gentoo/ ftp://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/ ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo" LANG="pl_PL@euro.UTF-8" LC_ALL="pl_PL.UTF-8" LINGUAS="pl" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/usr/portage/distfiles/porttmp/" PORTDIR="/usr/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X acl berkdb cli cracklib crypt cups dri fortran gdbm gpm gtk gtk2 iconv ipv6 isdnlog midi mudflap ncurses nls nptl nptlonly openmp pam pcre perl pppd python qt3 qt4 readline reflection session spl ssl tcpd unicode wxwindows x86 xorg zlib" ALSA_CARDS="emu10k1" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="pl" USERLAND="GNU" VIDEO_CARDS="vesa nv nvidia" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
x86 stable
ppc64 stable
ppc stable
Stable on alpha.
sparc stable
amd64 stable
Stable for HPPA. And closing.