www.tyda.se
This website serves as a great dictionary English to Swedish and Swedish to English. What I like most about it is the ability to hear the pronunciation. I used this website when I was learning Swedish- a very big help.
Also Google Translate (English to Swedish/Swedish to English) works wonders if you receive mail in Sweden that is in Swedish and cannot understand most of it! I used this countless times to understand the full extent of my mail as well as emails.
Hope that helps anyone who needs it!
Cheers