I've always maintained more or less up to date Snort RPMs for RHEL for personal use and have recently added Suricata. As they may be useful for others I have cleaned them up a little and made a YUM repository for EL6 i386 and x86_64. See the http://nsm-rpms.unx.ca/ for more info.
A few things to note:
These RPMs use a prefix of /opt/nsm to prevent conflict with similar RPMs you may have installed, its a little bit out of the norm for RPMs and I'm open to comments...
Snort and Suricata packages will never be automatically upgraded as often upgrading to a new version requires some administration work such as updating your configuration files. To facilitate this the packages have their version as part of the name and "-latest" pseudo-packages are provided which will always install the latest RPM but you will have to "snort-select" or "suricata-select" the new version to make it active. I'll probably have to add some more detailed documentation about this on the wiki.
As I'm also a regular Fedora user I'll probably add Fedora builds at some point as its little effort to me. If Fedora builds would be useful to you please let me know and I may do it sooner than later.