http://forums.civfanatics.com/showpost.php?p=4939727&postcount=2
there's a fairly good post about the HOF mod(if I do say so myself

), and here's the relevant info pulled from it:
That answer actually leads into an answer on what the HOF mod is.
It is a modpack that contains numerous user-made mods that do a variety of things:
It increases security on the GOTM saves, allowing the GOTM staff to be assured that it is a level competition
It provides an easier to access autolog, allowing you to write down your thoughts on the game as it goes, and providing a detailed account of the various messages Civ4 shows you each turn
It contains bug fixes that have not been addressed by Firaxis thus far(GP bugs, slavery bug, etc.)
It also contains a much better foreign advisor and domestic advisor than what ships with the game. They give you no information you couldn't get already, but it is collected, organized, and shown to you in your advisor screens in a way that is much easier to read, understand, and use. Eg. The domestic advisor will tell you what buildings have been built in what city, allowing you to better steer your empire's infrastructure without micromanaging every city. The foreign advisor has an upgrade in just about every screen, the resources, tech, relations, and even adds a current deals and current civics screen for you to check up on every possible aspect of your diplomatic game.
Basically, it makes it much easier to use all the information Civ4 gives us, saving time for those that already use that information, and giving the others access to it. It also gives better security, allowing you the knowledge that the games you are comparing yourself to were played on the same playing field as you had.
here's a link to the support thread for the HOF mod:
HOF Mod