leo is a free off charge dictionary from the technical university in munich. it translates german-english, english-german and german-french, french-german it has more than 400.000 english entries

there is even a pda optimized version available!

it get´s even better for mac osx users:

you can download a dashboard-widget!

• online: http://dict.leo.org/
  http://pda.leo.org/