As recommended on my last list, "Who Framed Roger Rabbit?" is one of the best animated features of all time. The work needed to make the entire thing work is epic. Richard Williams of the aforementioned Thief and the Cobbler (and writer of Luis' 'favourite' book, The Animator's Survival Kit) was animation director for the project, and his professionalism shows.
Roger Rabbit is unfortunately also a case study for why animators shouldn't animate on ones - while it makes the entire thing smoother when working with chromakeyed actors or photocomp work, it gives a very juttery effect if not used to such a fine degree, and doubles your work time.
Still, featuring perfect performances from Bob Hoskins and Christopher Lloyd, the film is excellent, and worth buying for the Toontown scenes alone. Here's a nice still, and a link to a youtube link from one of my favourite scenes, the Ink and Paint Club speakeasy (with a piano duel between Daffy Duck and Donald Duck)
Ink & Paint Club Scene