Erm
Doesn't Google already do this?
And for quite obscure units, too.
www.google.co.uk/search?hl=en&q=60+mph+in+rods+per+fortnight&btnG=Google+Search&meta=
(, Fri 2 Jan 2009, 15:10, Reply)
Yup
Google's tool is great if you know exactly which units you want to convert between and you don't mind typing out the whole thing. If you want to convert scientific units to real objects or you want any kind of autosuggestion or you don't know exactly what you want your output to be then it's no use. This is not intended to replace what Google does.
(, Fri 2 Jan 2009, 15:17, Reply)