>>> --tree implies --pretend... adding --pretend to options.

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

Calculating dependencies  ... ...done!
[ebuild  N    ] kde-base/kde-3.4.3  
[ebuild  N    ]  kde-base/kdeadmin-3.4.3  
[ebuild  N    ]   sys-process/vixie-cron-4.1-r8  
[ebuild  N    ]    sys-process/cronbase-0.3.2  
[ebuild  N    ]  kde-base/kdeedu-3.4.3-r10  
[ebuild  N    ]  kde-base/kdeaddons-3.4.3  
[ebuild  N    ]   kde-base/kdemultimedia-3.4.3  
[ebuild  N    ]    media-plugins/gst-plugins-mad-0.8.11  
[ebuild  N    ]     media-libs/libid3tag-0.15.1b  
[ebuild  N    ]    media-libs/libmad-0.15.1b  
[ebuild  N    ]    media-sound/cdparanoia-3.9.8-r2  
[ebuild  N    ]    media-libs/xine-lib-1.1.1-r3  
[ebuild  N    ]     media-libs/libdvdcss-1.2.9  
[ebuild  N    ]     gnome-base/gnome-vfs-2.12.2  
[ebuild  N    ]      gnome-base/libbonobo-2.10.1  
[ebuild  N    ]      gnome-base/gnome-mime-data-2.4.2  
[ebuild  N    ]    media-libs/taglib-1.4  
[ebuild  N    ]    media-libs/libsamplerate-0.1.1-r1  
[ebuild  N    ]     sci-libs/fftw-3.0.1-r2  
[ebuild  N    ] media-plugins/gst-plugins-esd-0.8.11  
[ebuild  N    ] media-plugins/gst-plugins-alsa-0.8.11  
[ebuild  N    ]    media-libs/gst-plugins-0.8.11  
[ebuild  N    ]     media-libs/gstreamer-0.8.11  
[ebuild  N    ]     gnome-base/gconf-2.12.1  
[ebuild  N    ]      gnome-base/orbit-2.12.4  
[ebuild  N    ]       dev-libs/libIDL-0.8.6  
[ebuild  N    ]     dev-libs/liboil-0.3.6  
[ebuild  N    ]    media-sound/lame-3.96.1  
[ebuild  N    ]   media-libs/libsdl-1.2.8-r1  
[ebuild  N    ]    media-libs/libggi-2.0.1-r1  
[ebuild  N    ]     media-libs/libgii-0.8.1  
[ebuild  N    ]  kde-base/kdewebdev-3.4.3-r1  
[ebuild  N    ]  kde-base/kdeutils-3.4.3-r1  
[ebuild  N    ]  kde-base/kdetoys-3.4.3  
[ebuild  N    ]  kde-base/kdegraphics-3.4.3-r3  
[ebuild  N    ]   media-libs/imlib-1.9.14-r3  
[ebuild  N    ]    media-libs/giflib-4.1.4  
[ebuild  N    ]   dev-libs/fribidi-0.10.4  
[ebuild  N    ]  kde-base/kdenetwork-3.4.3  
[ebuild  N    ]   dev-perl/IO-Socket-SSL-0.96  
[ebuild  N    ]    dev-perl/Net-SSLeay-1.25  
[ebuild  N    ]   app-crypt/qca-tls-1.0-r2  
[ebuild  N    ]    app-crypt/qca-1.0-r2  
[ebuild  N    ]  kde-base/kdeartwork-3.4.3  
[ebuild  N    ]  kde-base/kdegames-3.4.3  
[ebuild  N    ]  kde-base/kdepim-3.4.3  
[ebuild  N    ]   app-crypt/gpgme-1.0.2  
[ebuild  N    ]    dev-libs/pth-1.4.0  
[ebuild  N    ]    app-crypt/gnupg-1.4.2-r3  
[ebuild  N    ]     media-gfx/xloadimage-4.1-r4  
[ebuild  N    ]     dev-libs/libusb-0.1.10a  
[ebuild  N    ]     mail-mta/ssmtp-2.61  
[ebuild  N    ]      net-mail/mailbase-1  
[ebuild  N    ]   kde-base/kdebase-3.4.3-r1  
[ebuild  N    ]    sys-apps/eject-2.0.13-r2  
[ebuild  N    ]    kde-base/kdebase-pam-6  
[ebuild  N    ]   kde-base/kdelibs-3.4.3-r1  
[ebuild  N    ]    media-libs/libart_lgpl-2.3.17  
[ebuild  N    ]    dev-libs/libxslt-1.1.15  
[ebuild  N    ]     dev-libs/libgcrypt-1.2.1  
[ebuild  N    ]      dev-libs/libgpg-error-1.0-r1  
[ebuild  N    ]    dev-libs/libpcre-6.3  
[ebuild  N    ]    app-admin/fam-2.7.0-r4  
[ebuild  N    ]     net-nds/portmap-5b-r9  
[ebuild  N    ]    x11-libs/qt-3.3.4-r8  
[ebuild  N    ]     media-libs/nas-1.7-r1  
[ebuild  N    ]     media-libs/libmng-1.0.8-r1  
[ebuild  N    ]      media-libs/lcms-1.13-r1  
[ebuild  N    ]    net-dns/libidn-0.5.15  
[ebuild  N    ]    net-print/cups-1.1.23-r7  
[ebuild  N    ]     app-text/poppler-0.4.3-r4