Lexikon
The cached entries are also full-text searchable, with relevancy rankings.
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.