Games

N (ninja, by Metanet)
  The Linux version requires both libgtk 1.2 (gtk+-1.2.10-r12 (or the newest 1.2 version)) libstdc++-libc6.2.  These are old and not typically installed.  Instead, emerge Wine and use the windows version.  It runs just fine.  Also, if your vertical screen resolution is less than 768 (mine is 1024x576), run winecfg and under "Graphics" set a virtual desktop size of 1024x768.  Once you start the game, move the game window until you can see everything (specifically the time bar up top).

Installing Lost Labyrinth
  Since Gentoo does not have an official epackage yet, download the "Archive for Linux (All)" tar file.
  Emerge sld-image, sdl-gfx, sdl-ttf, sdl-mixer
  cd to /usr/lib, ln -s libSDL_gfx.so libSDL_gfx.so.4
  Untar the download file, and execute ./laby.exe (its a linux binary, they just gave it an exe extension)

Installing Phoronix Test Suite
  Download and extract the phoronix tar file
  Add the following to /etc/portage/package.use
    dev-lang/php gd -sqlite -crypt -truetype #php-toolkit is also installed as a dependency
    dev-php5/php-gtk -spell #if your using the gtk interface
  Add the following to /etc/portage/package.keywords IF you want the GTK interface
    dev-php5/php-gtk ~x86
  Emerge php and then emerge php-gtk
  Run ./phoronix-test-suite gui