Some Google ones are:

Google Annotations Gallery - http://code.google.com/p/gag/

Query times on Google search - Results 1 - 10 of about 672,000,000 for test [definition]. (at warp 8.88) - Results 1 - 10 of about 24,400,000 for foo. (2.00 shakes of a lamb's tail)

3d view on books and street view (try it!)

Translate for animals - http://www.google.co.uk/intl/en/landing/translateforanimals/

Any I'm missing?