If you're learning Swedish, chances are that you're familiar with the Lexin dictionary online.
This application provides access to the same dictionary, but it caches the entries on your computer so that subsequent searches are instantaneous and available offline (great if you have a laptop or use dial-up).
The cached entries are also full-text searchable, with relevancy rankings.
InstantTranslate makes it really easy to translate a selection of text in the application you are working in from one language to another language.
One World Dictionary by Ascendo is a leading multilingual reference tool for Apple desktops.
