For those considering something a bit more than a quick holiday there are a number of English speaking ex-pat sites and clubs. These have some very active forums with advice on the financial, legal and emotional consequences of living here.

http://www.thelocal.se - probably the most UK/Ireland centred of the sites there are also plenty of contributors from other commonwealth countries.

http://www.lostinsweden.com - a very social group that often manage to arrange meet ups in Stockholm, Gothenburg and Malmö.

http://www.amerikanska.com - as the name suggests it's the most American orientated of the three sites.  

http://www.sirap.info - Stockholm International Researchers Association - primarily set up for English speaking researchers many of whom are on fixed term contracts at various places in Stockholm. They tend to be more open than the name suggests and have a number of member generated activity circles including wine/whisky tasting, hiking and kayaking.