I was going through the Hiergamenon the other day looking at buildings, and it looked as though all of the entries were incomplete -- they described the buildings but didn't say what the buildings provide when built.  I realized that I had to hover over the icon for each entry in the Hiergamenon, while also having the entry open, to get full details about any given building.

Also, I was looking for information on the city types -- I'd love entries that show which bonuses go with each city type and which buildings are unique, along with links to the entries for each building.  This, and the ability to sort / filter other entries, probably would be far down on the list after other bug fixes right now, but it would make the thing much more useful.