Gorgeous city, I had a grand time (although the conference sucked up most of my time/energy). Lovely architecture, streets, waterways, food, shopping.
The Vasamuseet was astonishingly good. I saw the Mary Rose just after she was brought up, and so was expecting something comparable. Nope - the Vasa blows it away. For a museum built around basically a single artifact (admittedly, a REALLY big artifact), I'd be hard pressed to imagine anything better.