WeirdConverter.com (at http://weirdconverter.com) is simple: it is like a currency converter, but for completely unrelated items. For example:

WEIGHT
How many NASCAR Winston Cup Tires in an African Elephant?
How many kegs of beer in an Airbus A380?

LENGTH/HEIGHT
How many Shaquille O'Neals in the Great Wall of China?
How many giraffe's necks in the Weinermobile?

VOLUME
How many bathtubs in an average human stomach?
How many dump trucks in an Olympic Swimming pool?