I am a bit outdated...I am proceeding to install core 2 when the core 3 is out... :(
Can I upgrade from core 2 to core 3 ? how ?
Yes.
Download and install the Fedora Core 3 version of fedora-release and yum.
You can download them from
http://download.fedora.us/fedora/fedora/3/i386/RPMS.os/fedora-release-3-8.i386.rpm
http://download.fedora.us/fedora/fedora/3/i386/RPMS.os/yum-2.1.11-3.noarch.rpm
Then, as root -
yum clean all
rpm -e yum
rpm -Uh fedora-release-3-8.i386.rpm yum-2.1.11-3.noarch.rpm
rpm --import http://download.fedora.redhat.com/pub/fedora/linux/core/3/i386/os/RPM-GPG-KEY-fedora
yum update
-=- It'll take awhile - but it should work.