I've no idea why ppm can't access many of the modules directly from their site recently, but the modules you mention are available as .zip ppm archives for 5.6.1

On a Windows system, if you have Perl in your path, and ppm is in the same directory, it's fairly simple to install from a .zip archive.

Unpack the archive somewhere away from Perl. Open a DOS window, navigate to the directory you unpacked to, then type:
ppm install DBD-MySQL.ppd
(replacing "DBD-MySQL" with the module name, if different).

Modules for 5.8.0 seem to be very thin on the ground though.

__________
"Every program has at least one bug and can be shortened by at least one instruction -- from which, by induction, one can deduce that every program can be reduced to one instruction which doesn't work." -- (Author Unknown)