I have heard there are a lot of good second hand shops, antique markets etc. in Södermalm in Stockholm. I am especially interested in second hand clothes, books and interior decoration related stuff. Names of the shops and addresses are welcome.
Joanna wrote a great (design) city guide for stockholm: http://m.designsponge.com/2010/06/stockholm-guide.html
Lots of good 2nd hand shops are listed! And of course many more cool places to go. about 5 years ago