There's a great article on Kuro5hin today about living with Asperger's — the "Geek Syndrome" that imbues us with obsessive attention to (some) detail, a poor grasp of social cues, and a weird sense of humour.
Aspies tend to take an obsessive interest in detailed things. It is typical for an aspie to take an all-encompassing interest in something for a few months and later become interested in something else after having already learned enough about the first subject. In other words, we aspies have "weird," nerdy interests and hobbies.
This is a chicken-and-egg problem, of course. Do we aspies take up these perseverations because we are unable to occupy ourselves with more neurotypical (NT) (that is, something relating to nonautistics) socializing, or do our perseverations prevent us from socializing? Maybe it's a little bit of both.
Nevertheless, perseveration for me has meant spending my early teenage years learning how to program and becoming especially adept at using Windows. A little later it meant focusing on perfecting my French accent and reading French newspapers like Le Monde. Because of my perseverations, I have a more thorough understanding of history, politics, language, computers, psychology, geography, and numerous other subjects than the average person. In contrast, I have a deficit of knowledge about today's pop stars, actors, and social gossip. This sometimes makes it hard for people to have interesting conversations with me.