Is there someplace where all these items and their stats are listed?
Look here (http://demigod.wikia.com/wiki/List_of_items#Favor). Following up on obscenitor's suggestion, I mostly use QoT and Erebus, and I find the following favor items useful:
1. Erebus: Blood of the Fallen (yep, that's all I use with my Erebus assassin build).
2. QoT: I experiment a bit more with this demigod.
--Amulet of Teleportation: Good on big maps like Leviathan, Mandala, etc. Frees up an inventory
slot that would otherwise go to teleportation scrolls. (Wouldn't mind seeing the cooldown time
reduced a bit.)
--Cloak of Night: Will save your life better than anything else.
--Cape of Plentiful Mana: seems to be most effective later in the game when you have more base
mana (but probably need it less).
--Staff of the Warmage: nice early-game mana item (I am glad to see it get a slight buff).
--Swift Anklet: I only get this if I plan to combine it with Boots of Speed. However, QoT tends to
need more mana than speed.
EDIT: Since Erebus and QoT are generals, Spirit of the Fallen would not be availabe to them, so its not an issue for my gameplay (except for the fact that other players would be able to use it against me!). Tome of Champions would definitely become one of my favorite items for QoT and Erebus (although I do not usually do all-out minion builds with either of them).