# emerge -auDv --tree world

These are the packages that I would merge, in reverse order:

Calculating world dependencies ...done!
[blocks B     ] x11-libs/libXft (is blocking x11-base/xorg-x11-6.8.2-r2)
[nomerge      ] media-gfx/f-spot-0.1.0  -debug [2]
[ebuild  NS   ]  dev-db/sqlite-3.2.2  -doc -nothreadsafe 1,353 kB
[ebuild     U ] net-p2p/bittorrent-4.1.4 [4.1.3] +X 1,969 kB
[ebuild  N    ]  dev-python/pycrypto-2.0.1  150 kB
[ebuild     U ] sys-apps/less-385_p4-r1 [385_p4] 482 kB
[ebuild     U ] app-emulation/wine-20050725-r1 [20050725] +X +alsa -arts -cups -debug +gif -glut -jack +jpeg -lcms -nas +ncurses +opengl +oss 11,919 kB
[nomerge      ] app-cdr/graveman-0.3.12_p4-r1  -debug +dvdr +flac +mp3 -nls +oggvorbis -sox*
[nomerge      ]  app-cdr/cdrdao-1.2.0  -debug +encode +gnome -pccts
[ebuild     U ]   media-sound/lame-3.96.1-r1 [3.96.1] -debug -gtk 1,226 kB
[nomerge      ] net-analyzer/nmap-3.83  -gtk +ssl
[ebuild     U ]  dev-libs/libpcre-6.3 [6.1] -doc 552 kB
[ebuild     U ] sys-apps/lm_sensors-2.9.1-r1 [2.9.1] -sensord 850 kB
[nomerge      ] gnome-base/gnome-2.10.2  -accessibility +cdr +dvdr +hal
[ebuild     U ]  gnome-base/gdm-2.8.0.3 [2.8.0.2] -debug +ipv6 +pam (-selinux) -static +tcpd -xinerama 3,828 kB
[ebuild     U ]  media-sound/sound-juicer-2.10.1-r1 [2.10.1] -debug +flac +vorbis 506 kB
[nomerge      ]  gnome-base/gnome-volume-manager-1.3.4_pre20050818  +crypt -debug -doc [2]
[nomerge      ]   sys-apps/pmount-0.9.3-r1  +crypt
[nomerge      ]    sys-fs/cryptsetup-luks-1.0.1  -static
[ebuild     U ]     sys-fs/device-mapper-1.01.04 [1.01.03] 857 kB
[ebuild     U ] dev-util/cvs-1.12.12-r2 [1.12.12-r1] +crypt -doc -emacs -kerberos +pam 3,122 kB
[nomerge      ] media-video/dvdauthor-0.6.11
[ebuild     U ]  media-gfx/imagemagick-6.2.4.2 [6.2.2.3-r1] +X -cups -doc -fpx -graphviz -jbig +jpeg -lcms +mpeg +perl +png +tiff +truetype -wmf +xml2 4,723 kB
[nomerge      ] media-sound/gnomad-2.8.0  -debug
[ebuild     U ]  media-libs/libnjb-2.2.1 [2.2] 451 kB
[nomerge      ] media-video/totem-1.0.4  +a52 -debug +dvd +flac +gnome -lirc +mad +mpeg +ogg -theora +vorbis +win32codecs -xine +xv
[nomerge      ]  media-plugins/gst-plugins-flac-0.8.10
[ebuild     U ]   media-libs/flac-1.1.2-r3 [1.1.2-r2] -3dnow -debug -doc +ogg +sse -xmms 1,484 kB
[nomerge      ] dev-util/monodevelop-0.7  -boo -java
[ebuild     U ]  dev-dotnet/gconf-sharp-2.5.90 [2.5.5] 2,072 kB
[nomerge      ]  dev-dotnet/gecko-sharp-0.10
[nomerge      ]   www-client/mozilla-1.7.11-r1  +crypt -debug +gnome +ipv6 -java -ldap -mozcalendar -mozdevelop -moznocompose -moznoirc -moznomail -moznoxft -mozsvg -postgres +ssl +truetype -xinerama -xprint
[ebuild     U ]    www-client/mozilla-launcher-1.45 [1.44] 0 kB
[nomerge      ]  dev-util/monodoc-1.0.6
[ebuild     U ]   dev-dotnet/gtkhtml-sharp-2.5.90 [2.5.5] 0 kB
[ebuild     U ]    dev-dotnet/gnome-sharp-2.5.90 [2.5.5] 0 kB
[ebuild     U ]    dev-dotnet/art-sharp-2.5.90 [2.5.5] 0 kB
[ebuild     U ]   dev-dotnet/glade-sharp-2.5.90 [2.5.5] 0 kB
[nomerge      ] x11-themes/gnome-themes-2.10.2  -accessibility -debug
[ebuild     U ]  x11-themes/gtk-engines-2.6.5 [2.6.4-r2] -accessibility -debug -static 466 kB
[nomerge      ]    gnome-extra/libgtkhtml-3.2.5  -debug
[ebuild     U ]     gnome-base/libbonoboui-2.10.1 [2.10.0] -debug -doc -static 863 kB
[nomerge      ]     net-libs/libsoup-2.2.5  -debug -doc +ssl -static
[nomerge      ]      net-libs/gnutls-1.2.4  +crypt -doc +zlib
[ebuild     U ]       dev-libs/libgcrypt-1.2.1-r1 [1.2.1] -nls 938 kB
[ebuild     U ]  dev-dotnet/gnomevfs-sharp-2.5.90 [2.5.5] 0 kB
[nomerge      ] dev-perl/DBD-mysql-2.9007
[nomerge      ]  dev-perl/DBI-1.48
[nomerge      ]   dev-perl/PlRPC-0.2018
[ebuild     U ]    gnome-base/libbonobo-2.10.1 [2.10.0] -debug -doc -static 1,326 kB
[nomerge      ]    sys-apps/hal-0.5.4_pre20050816  -debug -doc -pam_console -pcmcia [2]
[nomerge      ]     sys-fs/udev-068  (-selinux) -static
[ebuild     U ]      sys-apps/baselayout-1.12.0_pre6-r3 [1.12.0_pre6-r1] -bootstrap -build -static -unicode 0 kB
[ebuild     U ]   dev-dotnet/gtk-sharp-2.5.90 [2.5.5] -doc 0 kB
[nomerge      ] x11-terms/xterm-204  -Xaw3d -toolbar +truetype -unicode
[nomerge      ]  sys-apps/utempter-0.5.5.6
[ebuild     U ]     x11-libs/cairo-1.0.0 [0.9.2-r1] +X -doc +glitz +png -static 1,405 kB
[nomerge      ]      media-libs/glitz-0.4.4
[nomerge      ]       media-video/ati-drivers-8.14.13-r2  +opengl
[ebuild  N    ]        x11-base/xorg-x11-6.8.2-r2  -3dfx -3dnow +bitmap-fonts -cjk -debug -dlloader -dmx -doc -font-server -insecure-drivers +ipv6 -minimal +mmx -nls -nocxx +opengl +pam -sdk +sse -static +truetype-fonts +type1-fonts (-uclibc) -xprint +xv 43,510 kB
[ebuild     U ]        x11-base/opengl-update-3.0.0 [2.2.3-r1] 0 kB
[ebuild  N    ]         app-admin/eselect-opengl-1.0.1  3 kB
[ebuild     U ]        app-arch/rpm2targz-9.0-r4 [9.0-r3] 2 kB
[nomerge      ]         sys-apps/util-linux-2.12q-r1  +crypt -nls -old-crypt +pam +perl (-selinux) -static
[ebuild     U ]          sys-apps/pam-login-4.0.12 [4.0.11.1-r2] -livecd -nls (-selinux) 0 kB
[nomerge      ] dev-python/python-fchksum-1.7.1
[ebuild     U ]    gnome-base/orbit-2.12.3 [2.12.2] -debug -doc +ssl -static 662 kB
[nomerge      ]     dev-libs/libIDL-0.8.6  -debug -static
[ebuild     U ]      dev-libs/glib-2.8.1 [2.8.0] -debug -doc -hardened -static 2,501 kB