Here's what I know of:
WDW
•Monorail - They have released about 10 colors by now I think and two different versions the newer one has opening doors
•Straight Track - pack of 4
•Curved Track - pack of 4
•Contemporary Hotel
•Spaceship Earth (Discontinued) - This is the original one that the monorail went underneath spaceship earth.
•Disneyana "Silver" Monorail - Very limited edition special packaging and the whole thing is colored silver
•Disneyana "Silver" Contemporary - Same as above
•Disneyana "Silver" Spaceship Earth - Same as above
•TTC Switching Station (Discontinued) - Has three switches at each end to create three separate loops themed to TTC
•Polynesian Hotel (Dicontinued) - Includes a great ceremonial house and station (If you by two of these and put the station parts end to end it creates a station that is the correct length of the train)
•Grand Floridian Hotel (Discontinued) - The grand Floridian station
•Cinderella Castle Playset
•WDW Sign Set (Discontinued) - includes WDW Main Entrance sign(lights up), WDW directional road sign, Contemporary sign, Polynesian sign, and Grand Floridian sign(lights up)
•WDW Tree and Light set (Discontinued) - Includes Main Street Light(lights up), tomorrowland metallic palm tree, and Contemporary "Dixie Cup" style tree
•Astro Orbiter Attracion (Dicontinued) - Includes two disney characters and can be activated by the monorail with seperately sold attraction connector
•Dumbo Attracion (Dicontinued) - Includes two disney characters and can be activated by the monorail with seperately sold attraction connector
•Tea Cup Attracion (Dicontinued) - Includes two disney characters and can be activated by the monorail with seperately sold attraction connector
•Attraction Connector (Dicontinued) - Plugs into attraction and attaches to monorail pylon
•WDW Haunted Mansion (Discontinued) - No attraction connection
•New Spaceship Earth - More of a standalone playset
•Tree of Life Playset (Discontinued) - Really has nothing to do with monorail but is packaged in monorail packaging
Disneyland
•Disneyland Monorail (Discontinued) - An accurate model of the Mark V monorail, this was the most detailed monorail two right down to the doors, rearview mirrors, and escape hatches and includes the Golden Gate Bridge
•Disneyland Mini Monorail (Discontinued) - Same as above but only included the two end cars, a little less track, and no bridge
•DCA Orange Stinger (Discontinued) - Works with attraction connector
•DCA Golden Zephyr (Discontinued) - Works with attraction connector
•DCA King Tritons Carousel (Discontinued) - Works with attraction connector
•DCA California Screamin (Discontinued) - A real pain to put together but really big once its done with either orange or purple cars
•WDW Monorail sold as Disneyland monorail - Just a different package for the WDW one
•Disneyland Haunted Mansion (Discontinued) - Same as WDW version but modeled after Disneyland's Haunted Mansion
I think that covers most of it, I probably left something out or got something wrong so feel free to offer any correction.