Mine are (not in particular order):
Troy (R1 2-Disc Ultimate Edition)
Why I love this release: Diane Kruger, extended cut, restored video, gorgeous packaging
Perfume: The Story of a Murderer (Korean 3-Disc Premium Edition)
Why I love this release: Soundtrack CD, gorgeous packaging, DTS audio
Pan's Labyrinth (Korean 2-Disc Limited Edition)
Why I love this release: Guillermo del Torro, cool packaging, DTS audio
Curse of the Golden Flower (HK Collector's DVD Box Set)
Why I love this release: Gong Li, chess set packaging, DTS audio, stunning imagery
300 (R3 2-Disc Steelcase Edition)
Why I love this release: 'Coz Frank Miller ain't such a diva unlike Alan Moore, steelcase packaging, cool artwork, stunning imagery
Ratatouille (R3)
Why I love this release: Brad Bird & Pixar, French cuisine, stunning animation, DTS-like Dolby sound, nice story, cheap price
Planet Earth: The Complete Series (R1)
Why I love this release: Planet Earth, unique bird mating rituals, more Arctic penguins, Sir David Attenborough, amazing camera work
Blade Runner (R1 5-Disc Ultimate Collector's Edition)
Why I love this release: Ridley Scott, extended cut, cool packaging, uber loaded special features
* Amazon dispatched my copy on the last week of December 2007, so it still qualifies under my 2007 purchases
Madonna: The Confessions Tour - Live From London (DVD/CD Album Bundle)
Why I love this release: Madonna, DTS sound, top-notch production, very reasonable price
The Rodgers and Hammerstein Collection (R1 12-Disc Box Set)
Why I love this release: The Sound of Music, great collection, new special features, restored video and audio, got it cheap for only US $39
Other 2007 purchases that almost made it to my list:
Harry Potter and the Order of the Phoenix (R3 2-Disc Special Edition)
Why I love this release: Harry Potter, loaded special features
Why it failed to make my Top 10: Warner's stupid marketing changes, slipcase could have been better
The Departed (R3 2-Disc Steelcase Edition)
Why I love this release: Oscar Best Picture, cool artwork, steelcase packaging, cheap price for a 2-disc steelcase release
Why it failed to make my Top 10: Missing special feature
Mariah Carey - The Adventures of Mimi (R3 2-Discs)
Why I love this release: Mariah Carey, red Amaray casing, DTS sound, cheap price
Why it failed to make my Top 10: Some sound cracking (must be from the concert itself), Mariah doesn't dance too much
An Inconvenient Truth (R1)
Why I love this release: Environmentally-friendly packaging, well-researched & documented arguments
Why it failed to make my Top 10: Al Gore's self glorification snippets
Transformers (R3 2-Disc Steelcase Edition)
Why I love this release: Great action & FX, Shia & Megan
Why it failed to make my Top 10: Fingerprints on steelcase, very expensive, no DTS sound
Dreamgirls (R1 2-Disc Showstopper Edition)
Why I love this release: Beyonce, great soundtrack, loaded special features
Why it failed to make my Top 10: No DTS track, too much texts on cover art