Vyvyan Basterd
Adventurer
I will admit that I completely lost interest in Zeitgeist when I saw that it was going to be 4e only.
When Zeitgeist was announced for 4e exclusively, I never bothered to look at it.
I think you're both going to miss out on some good material in the future if you continue with this attitude.
I've used both the Rise of the Runelords adventure path and Council of Thieves in 4th Edition.
I would have missed out on two great Paizo adventure paths if I decided to ignore them because they are exclusively 3E.