bz2 and gz on SourceForge. There's also a patch there to fix a Perl 5.8-ism in scljed.
I am especially looking for people with pre-5.6.1 Perls to test for unsupported code. Please let me know the results, whether it's buggy or "works for me". I would also appreciate reports on where the documentation could be improved.
Obligatory screenshots link [fixed; thanks elisteran]