Let me give you a small stack of links to help you with that...
This is the Gearing Up For Eberron Archive. It is what WotC put on its web page for some prerelease information. The Whirlwind Tour of Khorvaire is pretty nice.
Try to ignore the Extreme Explorer PrC... or at least its name. It is a PrC who's niche is manipulating Action Points. It got saddled with an unfortunate name. Happens to alot of nice people.
These are Dragonshards. They are free articles about different facets of the setting writen by the creator, Keith Baker. The ones on the gnomes of Zilargo are my favourite I think.
There are also alot of good solid reviews on this site and on RPGnet to help you out. They are probably more in depth than most posts... especially ones made while somebody is struggling with sleep.
One thing that probably needs to be addressed is a common misconception. "Everything in D&D has a place in Eberron." That was a main marketing thrust from WotC and it is often brought up as "everything in D&D can be found in Eberron." It is a fine distiction, but it can make the difference between the setting looking versitile or crowded.
You like Psionics? We have several origins of psionics integral to the setting. Don't like them? They are easily pushed to the background. Pay them no mind.
Like druids? We got druidic sects devoted from protecting the world from abberations and planar incursions to bringing about the end times so that the world can renew in a grand cycle.
Dragons? Lots of flavors and none of them dependant on color. Except on a broad sort of level. For example whites are still reletively small, stupid and ill behaved... just not set to evil as the default.
Orcs? What, savage blood thirsty savages, noble fiend slaying guardians or just plain sort of folk that live along side humans? We got those in the mountains around the Mror Holds pestering dwarves, doing a barbarian sort of Gondor thing on the edge of the Demon Wastes and just trying to get by like everybody else in the Shadow Marches.
Seriously, check it out. There is alot of good stuff in there and plenty of dials to fiddle with and get your Eberron just the way you want it.