Because of the
link posted by another user regarding the second coming of Compiz, I took the liberty of compiling the updated source code packages for Slackware. You may
download the tarball here. Untar this and install (or update: the safest route would be to use
upgradepkg --install-new to avoid installing several versions of the same packages) the individual packages.
I loved Compiz, but couldn't make use of it before because of Emerald's tendency to segfault; I have used the new version for several days for over 12 hours at a time, and not once has Emerald segfaulted. I find that the problems with the original implementation to have been fixed.
If anyone finds the visual effects of Compiz appealing, then I hope these packages are of use to you.
Happy Slacking!