To answer the original post (and probably re-iterating the obvious and previous posts):
* Cryptic hybrid exploration in Captain Blood
* 2 player co-op fighiting in Double Dragon
* Near-perfect puzzle design in Lemmings (apart from level 119)
* Multiplayer 2D scroller shmup in Silk Worm IV
* Interface design in Monkey Island (and story of course)
* Pinball Dreams as a physics game precursor
* Polygon fluidity in Another World (with Flashback as a worthy follow up)
* Sheer genius of Chip's Challenge and Supaplex
I obviously have not adhered to the "
last 10 years"
restriction, but I don't feel many games have been as innovative since then except for Portal and more so, DROD.
Obviously, these are my personal opionions