your how-to's are great, but I really think that you should include installation of zlib-1.2.3 into http://www.howtoforge.com/perfect_setup_fedora_core_3
It is very anoying when ./setup of ISPConfig breaks because of:
configure: error: The installed zlib version may contain a security bug. Please upgrade to 1.2.2 or later: http://www.zlib.net. You can omit this check with --disable-zlib-vcheck but DO NOT REPORT any stability issues then!
ERROR: Could not configure ClamAV
This code works (at least for me):
tar xvfz zlib-1.2.3.tar.gz