I installed mono from here: http://www.go-mono.com/download/fedora-3-i386/. Add the mono.repo from that page to /etc/yum.repos.d and stay updated. Those running FC4 need to install gtkhtml3 from FC3, using your favorite mirror: rpm -ivh --oldpackage http://mirror.hiwaay.net/redhat/fedora/linux/core/3/i386/os/Fedora/RPMS/gtkhtml3-3.3.2-3.i386.rpm on my system, that results in: # rpm -q gtkhtml3 gtkhtml3-3.6.2-1 gtkhtml3-3.3.2-3