E.N. Publishing offers the first adventure of ZEITGEIST for free, but if you're curious to read how well it runs for actual gaming groups, or if you're interested in the campaign but won't be able to run it yourself, turn your eyes to some of these story hours.
I think it's kinda cool, having so many versions of the same basic plot, like watching 8 different directors' takes on the same Shakespeare play. And if you're running ZEITGEIST it's a great resource to see how other groups are handling the adventures.
Ongoing Campaigns
These are the campaigns that are still being updated regularly.
Ajar: A game using
Google Hangouts, currently in the middle of adventure three.
al_fredo: This one is
recently started.
d2OKC: This
thread regularly includes photos of battles in progress. Sitting right before the climax of adventure three.
gideonpepys: The
Adventures of Korrigan's Company, one of the most outspoken GMs running the campaign, currently on adventure four.
Isklexi: A
4e campaign, with fairly short updates.
ltclnlbrain: This
group seems to be furthest along, playing faster than we can write.
mcmillan: A brand new group apparently playing in a store called
Clockwork.
Noodle: Short, and hasn't been updated in a while, but he occasionally pops up in other threads. Last I heard he's near the end of adventure three, or maybe just starting four.
Sbodd: This is
recently started.
Not Being Updated
These might still be useful to see how other groups enjoyed the early adventures.
Cheezmo Miner: He posted his
campaign on Obsidian Portal.
Colmarr: I believe the
first poster to talk about his ZEITGEIST game. He stopped posting as of the end of adventure two. (Anyone know where Colmarr is these days?)
OnlineDM: This one is actually being run by one of the original playtesters, though he only ran the first adventure.
ridingsloth: The players in
this group actually set up a bulletin board to track clues in a murder investigation. Last update during adventure two.
Siberys: Alas, this thread only has
one entry.
Also, bonus, here are a few storyhours about War of the Burning Sky.
Eccles: http://www.enworld.org/forum/en-publishing/299876-campaign-writeup-2-updates-september-7th.html
Kmdietri: http://www.enworld.org/forum/en-pub...ning-sky-campaign-saga-3-5-adventure-log.html
Ormazd: http://www.enworld.org/forum/en-publishing/298894-ormazds-campaign-log.html
Cafu - The Gate Pass Irregulars:
http://www.enworld.org/forum/showth...-Irregulars-A-War-of-the-Burning-Sky-Campaign