Anton Johansson, of Osom and Headler, has written a good post on Stockholm as a startup hub, especially in comparision to Berlin. I wholeheartedly agree that Stockholm would be well-served by another conference the size of SIME and a great English startup blog. On the other hand, I'm not sure that there actually are that many active Swedish angel investors in Stockholm. The best angel investor active in Stockholm is probably Klaus Hommels, who have invested in Tictail, Spotify, Stardoll and Klarna among others.
On a related note, this Friday between 18.00 and 20.00 it is STHLM Tech Meetup with Heiko Hebig (Head of Partnerships, Facebook) and Tyler Crowley.