Here's a semi-in depth list of the deleted content (I've not bothered referencing cut lines and just concentrated on excised scenes):
* The Ghostbusters visit the old Firehouse (The damaged sign is seen, as is the ruins of the Containment Unit).
* The old damaged sign is removed from the Firehouse and replaced with the new "peace" logo.
* Ray nearly crashes Ecto-1A.
* Louis tries to trap Slimer, and then tries to blast him, leading to an alternate scene where Janine asks if she's interested in helping babysit Oscar.
* Alternate version of Ray, Egon and Winston approaching Venkman before finding the river of slime (unlike the scene in the final film, this one had the three of them appear at Venkman's door rather than outside his building).
* The guys briefly speak to the cops outside of the restaurant before they're taken to see the Mayor.
* Louis speaks to Sherman so he can get the guys out of Parkview.
* The Ghostbusters arrive at the museum and speak to the fire crews, before speaking to the Mayor after he arrives (this is the same sequence that sees Hardemeyer sucked into the slime wall).
* An alternate finale where instead of being possessed, Ray is held captive by Vigo before he's slimed.
* The Ghostbusters meet up with Louis and the Mayor on the steps of the Museum.
* The Ghostbusters receive the key to the city at Liberty Island.
We probably won't see the destroyed Firehouse stuff, or likely see Ray being held hostage... but I too would like to see the "crash" deleted scene, as well as the stuff with the Mayor at the museum... and even Louis's excised scenes.
Hopefully one of you chaps will upload them to Youtube.