I know you've been waiting far too long for that. Now that Compiz and Compiz Fusion 0.6 are out, I've added them to portage.
The background: Compiz and Beryl, the two famous 3D-composite/windowmanagers for Linux, have merged forces. Main Compiz still resides in the package x11-wm/compiz, many additional plugins and tools are fetched in by the x11-wm/compiz-fusion metapackage.
The ebuilds are all based on the
xeffects overlay, with some cleanup by me.
Happy window-wobbling!