It's early and I'm going from memory, but here goes...
June - Pirates Month
Dead Man's Chest Game (outside VMK)
PoTC2 Poster
Dead Man's Chest
Skeleton Monkey
Davey Jones Organ
Jack Sparrow Costume (4 piece)
The game is still there, gives you random codes for one of the above. Jack Sparrow is a 1/5000 chance to get. All of the above is no longer tradable, except the Sparrow costume.
"Other" Pirates game (outside VMK)
Galleon Ship
This game has been closed and the Galleon Ship pieces are not tradable.
There was a 5-piece pin set, the Host Giveaway pin was the "Jolly Roger", also there was a one day Quest for a Pirate Hat w/Eye Patch.
I think the High School Musical In Park Quest came out in around early June (still out at both DLR and WDW). Had a Gym Room and a Piano. There was (still is) a HSM In Game Quest for a microphone. Plus as a boy you could, in game, you could buy a Wildcats Sweat Suit (3 piece) and a girl can buy a Red dress (3 piece)
July - Water Park Month
Tiki items were retired and Water Slide ride pieces and all sorts of water themed items were made available and still on sale at Ned's.
Two rooms were quested, but now available for sale (Blizzard Beach and Typhoon Lagoon).
Up/Down slides (from Slide-a-thon and later quests, and now as prizes for the "beach games" on the main screen) - Not Tradable.
There was a water park themed 5-piece pin set, the Host Giveaway pin was the "Surf" pin.
On Independence Day there was a Mickey Ear Flag Top Hat sold (one day only) There was a quest for a July 4th Pin.
Somewhere in here was the VMK Birthday Quest Pin and they sold Green 50th Director's Chairs.
August - Quest Month
Lots of quests, for various colors of Turnstiles, scoreboards, and penny presses (blue, red, green, and purple - these continued through September, I think), for Tiki items (especially the then-recently retired Tiki Fountain) and water park items that were already on sale.
There was a weekly Quest for a Pin: Mickey Quest, Dogs, Cats, Disney Mountains, was there one more? I can't remember ...
There was a 5-piece Food pin set: Churro (Host), Popcorn, Pretzel, Ice Cream, Turkey Leg.
Somewhere around the end of August they released the In-Park Pirate Quest (a bit late, haha) which gave a 100-credit code (well, was 500, but they changed it the first day), a Pirate Well, and a new Pirate Room. This is still running at DLR and WDW.
September - Tron Month
Tron Room (Quest)
Tron Costume (4 piece)
Tron Tank Chairs (red and yellow)
Tron MCP Poster
Tron Lightcycle Couch (blue and yellow)
Tron Teleporters
All of the above are retired except the Lightcycle couches (still on sale at the Inner Space shop Specials, or at least were a couple days ago).
There was a five piece pin set with the yellow Lightcycle Pin being host.
That brings us up to-
October - Halloween Month
There's a Pumpkin Pin Quest (in game) and a DLR Exclusive Mickey Mouse Pumpkin Quest. There's a five piece pin set (Ghost is host, Bat and Pumpkin have already been on sale).
10/2 - 10/8
it's a small world Imports
Yellow Princess Outfit, girls only
Golden Horseshoe Mercantile
Brown Haunted Mansion Suit
Black Haunted Mansion Suit
Top Hat
Emporium
Kings Crown, boys only
Also all previous Halloween items (Mickey Pumpkins, Skeleton Chairs, Chernabog Rugs, and Spider Web Wall dividers) were put back on sale.
Bat Magic (regular and 1-shot)
10/9 - 10/15
it's a small world Imports
Blue Princess Outfit, girls only
Golden Horseshoe Mercantile
Native American Costume
Emporium
Witch Hat, boys and girls
Schedule to be released:
10/16 - 10/22
* Green Superhero Costume
* Pink Superhero Costume
* Yellow Explorer's Outfit
* Mystery Item!
10/23 - 10/31
* Pink Princess Outfit
* Red Cowboy Outfit
* Black Cowboy Outfit
* Mystery Item!
I think that covers everything... Did I miss anything? Maybe... Heh. Don't remember.