Hi,
I am thinking about releasing first gtk+ 3 version of metacity this weekend.
Please test master branch and report any regressions or new bugs you find. I will try to fix them if I can or will postpone releasing if there will be serious bugs.
Changes:
* Use gtk+ 3 instead of gtk+ 2.
* Now composite manager is enabled by default.
* Side by side window tiling, enabled by default.