Great examples

Check out Marcelo Sakai's reel if you haven't already:

Marcelo Sakai animation reel

and here Lukasz Burnet's clips, showing a huge variety:

Luke_Reel2

My Horse And Me 2

LukeBurnetTestAnim

Stephan Brezinsky's old lady with the speaker is awesome!
Reel Stephan Brezinsky

And here Uldarico Lim Jr's reel:
Demo_2009