Long about 20 years ago I GM'ed first edition Earthdawn in one of the most successful campaigns I've ever run. We ran every module that came out and explored all the corners of Barsaive. My PCs went from 1st to 8th circle by the end. Then, life got in the way, parts of the group broke up, and Earthdawn was put to rest for the moment.
Flash forward to now and my FLGS had a sale on the 4th edition Player's Guide and Gamemaster's Guide, so in a burst of nostalgia I snagged them both. Interesting choice for book size, I have to say, make them physically shorter but a lot thicker! I've been doing some skimming through, and it looks like there have been a bunch of changes since 1st edition. No worries, every game evolves as time goes on. I don't suppose that anyone has a list o' changes from 1 to 4 to make it easy on old fellers like me? I plan to give these books a proper thorough read as well, but I don't want to miss anything that's been updated. I'd rather try the new Earthdawn chassis in and of itself going up and down the highway a few times, before I go bolting on a custom exhaust, rewiring the engine, and overinflating the spare tire.

It also seems like the campaign start date has shambled forward a fair piece. My original group never got to the Theran War (though I do have Prelude To War, and the two Living Room Games supplements Barsaive At War and Barsaive In Chaos) and it looks like 4th edition starts after the war is complete. I may have to dial that back a ways since I'd like my new group to be part o' something like that, especially the couple old timers who were with me the first time around.
So obviously I missed a lot of Earthdawn here! I knew about Living Room Games taking ED to 2nd, but past that I lost track. I see that there was something called a "classic" edition, then 3rd edition, then revised edition? And finally 4th now. Whew! I have a line on someone looking to get rid of some 2/c/3 Earthdawn books, so my next question is - how compatible are previous editions? Is it a lot of work to make them work or can it just be eyeballed? I'm not talking about location fluff, more like how the adventures would run. Also, are there any adventures or books from previous editions people would recommend as being really good?
Thanks a whole bunch for letting me ramble on a spell!
YW