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 0.8
CVS
Latest code is available via CVS; you can browse the CVS repository
online here
or you can checkout the code:
cvs -z3 -d:pserver:anonymous@suspend.cvs.sf.net:/cvsroot/suspend co suspend
Detailed instruction about the use of the CVS are available here.