If you can get your hands on it, the old Earthdawn material is still out there -- wouldn't help as far as game mechanics, but story, fluff and ideas, they'd be pretty useful.
Earthdawn Sourcebook ListI'd recommend:
*Denizens of Earthdawn
*Creatures of Barsaive
*Legends of Earthdawn
*Horrors ---> ding, ding, ding!
*Parlainth (box set and adventures) --> City taken over by horrors and then trapped in astral space for a loooong time=grumpy horror(s)
*Shattered Pattern -->interesting adventure - involving...well, oddly relevant items to SR in 2075
*Infected --->another adventure that has oddly relevant ties...
*Magic: A Manual of Mystic Secrets
*Arcane Mysteries of Barsaive
*Secret Societies of Barsaive --> behind the scenes players - perhaps some still exist in some form in 2075
*The Book of Exploration --> short stories and plot hooks
*Earthdawn Survival Guide --> various hazards of living in Earthdawn
Any of the original Earthdawn material could be used (if you aren't following canon in your campaign) -- there are other books that have tie-ins to the IEs of the current world. Depends how much background you want to dig into. I'd like to throw in some old pattern items that are found in SR 2075 -- not so much for the crossover, but just that it would be cool to do. There has to be some unopened Kaer's out there!
