My first thought was disappointing, but after I stopped expecting it to give me information and figured out that it deals solely with data, I now think WA is a fascinating, if very geeky, tool. I can't really think of any real-world use that I could put it to, but I guess it isn't aimed at people like me who don't use statistics and numerical data with any regularity.. As a concept it is impressive though.
Some of the odd things you can get it to do (although why you'd need to is another thing..):
Convert obscure units: "50mph as furlongs per fortnight"
Basic maths with food: "cheeseburger + 5 sticks of celery + orange juice"
Maths with dinosaurs too: "weight velociraptor * 100 / weight tyrannosaurus"
See how much a film sequel was a flop: "box office total jaws, jaws 2"
Genealogical relationships: "grandfather's grandmother's cousin's grandson's aunt"