In orded to try µswsusp you must run a recent -mm kernel or mainline 2.6.17-rc1.
Official releases are available on sourceforge for download.
Latest release
µswsusp 1.0
GIT
Latest code is available via GIT; you can browse the repository
online here
or you can checkout the code:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-utils.git