This build corresponds to the Perl 5.8.0 source code release.
The 800 series builds of ActivePerl are not binary compatible with builds in the 500 or 600 series. Any extensions built using binaries from the ActivePerl 500 or 600 series will need to be recompiled. Note especially that this applies to PPM packages that may have been built for 500 or 600 series builds.
Actually, I did download the sources and tried to build from them, but some tweaking of build settings is needed, as a minimum. If I succeed in building it, where would you suggest to place the module for others to use? Send it to Dave Roth? Perlmonks? Other?