This will take a while, and I can't fathom how I managed to keep all this stuff in a one bedroom apartment for eight years. Now that I'm in a larger place, I shake my head in wonder at my organized pack rat self.
Books / Magazines
Brian Jacques - Redwall, I own just about every novel in the series except four or so of them in the middle--so 18 novels.
M.I. McCallister - Mistmantle Chronicles, all 5 novels that came out in the series
Kathryn Lasky - Guardians of Ga'Hoole, almost all of the books on the warriors, I don't have the ones about the tales, only ones that advanced the original plot, so 12 novels
Paulette Bourgeouis and Brenda Clark - Franklin, about 12 books, really enjoy Clark's art in these
Ken Forsse - Adventures of Teddy Ruxpin - about 12 of the books, along with their tapes; no Teddy Ruxpin though, pretty certain he broke and I've just never bought another one
Stephen Cosgrove and Robin James - Serendipity series - I must own about 40 of these simple storybooks with really nice artwork
nwf.org's Ranger Rick - I'm the semi-official historical curator for the magazine since I have the largest private collection, so I own just about every issue from 1967 to 2000 so roughly 350 magazine copies give or take; I keep a website online for people to visit about this and I've had quite a few ask for help finding an issue because the actual organization doesn't have the information
Music
Fox Amoore - FA Collection 6, some of 7, and Ballad of Midnight (new age/soundtrack furry artist)
Movie (+ soundtrack on cd when applicable)
101 Dalmations + soundtrack
All Dogs Go to Heaven + soundtrack
An American Tail + soundtrack
Balto + soundtrack
Balto 3 - Wings of Change
Bambi + soundtrack
Brother Bear + soundtrack & promo score
Charlotte's Web (1970s animated one)
Chicken Run + soundtrack
Chip and Dale Rescue Rangers (vol 1 and 2)
Darkwing Duck (vol 1 and 2)
Dynomutt Dog Wonder
Emmett Otter's Jug Band Christmas
Finding Nemo
Fox and the Hound
Franklin TV Series
Garfield and Friends (some episodes on dvd)
Happy Feet
Ice Age Continental Drift
Kung Fu Panda (1 + 2)
Laff a Lympics (most episodes on DVD)
Land Before Time + soundtrack
Legend of the Guardians + soundtrack
Lion King + soundtrack
Little Bear (some episodes on dvd)
Looney Tunes (multiple collections)
Monsters University
Muppet Christmas Carol
Muppet Treasure Island
Over the Hedge + soundtrack
Pinky and the Brain (vol. 1 + 2)
Plague Dogs (uncut version)
Planet of the Apes
Rescuers Down Under + soundtrack
Rise of the Guardians + soundtrack
Robin Hood (1970s animated)
Rocky and Bullwinkle (some episodes on DVD)
Scooby Doo - Where are You? (seasons 1,2,3)
Scooby Doo Mask of the Blue Falcon
Scooby and Scrappy Doo (season 1)
Secret of NIMH + soundtrack
Tom & Jerry (vol. 1)
Valiant
Watership Down + soundtrack
Watership Down TV Series + soundtrack
Zootopia + soundtrack
Whew...I think that's all of it.
Like my title says, I spend a lot on books, dvds/blu-ray and cds.