ok, a few clarifications/etc;
Agreed on early domestiction (maybe merge with taming?): by ruminants I basically ment Cows, Camels, Oxen and the like
Smoking is supposed to be Smelting (Imageshack fail there)
I'm thinking Sun Worship and Astrology should be merged
Solar Calendar is basically formalised Astrology (effects would be agri bonus mainly)
Estates is a prereq for fuedalism, I was thinking of the Roman Latifundia system
I know steel seems a little early but it was always a matter of mass production (you could probably rename this to weapon crafting or something - Roman/fuedal Japan quality)
Alchemy would be a prereq black powder and metallurgy, could have some health benefits (some of their potions actually did work, sometimes!)
Serfdom is basically the improved version of Estates (around 10th century: further agri bonus)
Trace Italienne was the best name I could think of for post gunpowder fortification technology (upgraded city walls and Castle replacement tile improvement)
Astronomy would be Galileo/Copernicus era (prereq of Laws of Motion and Longitude [with clockwork])
Effects of Revanchism would be same as fascism but also prisons (concept of formalised revenge- I just like the word

)
And frankly I put Aluminium in there because I couldn't think of a less direct name for it (I guess you could make its discovery with chemistry and usability with whatever gives hydroelectric power)
As for the era names I would rename early dark ages as just Dark ages and later dark ages as the High Middle Ages (or just middle ages). Pesonally if I were stiking to the dates you used I would call ages 10 and 11 the 1st and 2nd Industrial Revolutions and rename 12 the nuclear/atomic age and try and think of some new names for the future ages (mostly coz I'm not a fan of the word Modern in this context; and Postmodern gets me mad

)