I don't know why, but it seems that some of you guys are obsessed with the thought of labelling the E:WoM fantasy as something we already know, ie. norse, greek, japanese mytholgy. Stardock has the oppportunity to do exactly what they like with their fantasy setting, and the way I see it, there's really nothing that stops them from doing just that.
IMO: screw the real world historical technological developments. E:WoM has a completely different outset. IT HAS MAGIC! Why would the people ever need to invent gunpowder when their leaders can command meteors from the heavens with their voice, alter the tides with a thought or summon earthquakes with a flick of their wrist? But then again, why would such a people ever bother doing anything? Beats me...
That stance however would make for a rather boring 4X game, so ON TOPIC: What technology span I really would like to see was something that started simple: hunter/gatherer society, moving on to basic agriculture, animal husbandry, metallurgy, mechanical machines. I agree with the people saying that gunpowder should be left out, and in reality I think that it's quite possible for the world to *not* have invented gunpowder, seeing as it quite possibly started out as an accident anyway. Techs that supported the channelers innate powers would be cool. Something in the ways of magically powered mills, magical item creating (staffs, rods, orbs etc. that could possibly be given to weaker channlers, imbueing them with more power), automatons imbued with magical life (e.g. golems)
On the topic of roads: I think that both dirt roads and cobbled roads should be available at all times. I don't think it's that much of a leap that it warrents it's own tech upgrade. It's been used all over the world, but the building of roads (both dirt and *especially* cobbled) requires VAST amounts of workpower.
Also: the Spell of Mastery would be the equivalent of dropping a billion nukes on top of the enemy, but with the positive side effect that instead of annihilating the planet, you win.