I have Aspergers, and I'm willing to answer questions if you like--though being Aspergers I can also tell you that putting my experiences into words is difficult and that everyone experiences Aspergers and autism differently.
Regarding coping with overstimulation, I tend to withdraw into myself. My mom calls it "shutting down," which isn't an inaccurate description. I keep my head down, I don't speak--and become rather irritable if spoken to--and in general try my best to shut out the outside world. I also get very frustrated. On which note, I really don't handle stress well. Not constant stress, anyway. While I loved my classes, worrying about my grades (despite being an A student) and deadlines made college very stressful for me; that's why I didn't really get back to writing until I graduated.
One thing worth mentioning, though, is that it's not always easy to tell who is Aspergers. Most of my friends don't know I'm Aspergers unless I've told them. I'm a bit awkward in conversation, yes, but I can talk quite fluently if it's a subject I'm interested in (just forget trying to engage me in small talk). By the time one has reached the upper teens, you learn how to act normal, at least publicly. Or at least I did.
What Thrash said about girls is somewhat context sensitive. To be honest, most of my friends have always been girls. True, the first time I asked a girl out I was absolutely scared to death (though I think that goes for most guys) and I did it by e-mail because I knew if I tried asking her in person it would come out more like asdklgjfkljgksdjg, but I've always been more comfortable with female friends than male friends. I've never related well to other guys, even though my best friend since middle school is a guy.
What Thrash said about preparing oneself for stimuli is absolutely true, and having down time in between is absolutely critical. If I'm around too many people for too long too often, I freak out.
Routine is important, too. Even normal situations can become very frustrating if it's different from my routine. Changing plans or routines is in a similar vein. Which isn't to say I can't do something spontaneous, but I prefer to plan in advance when possible. It just makes me more comfortable.
Aspergers can feel very isolating, especially since all my friends are NT (neurotypical--not on the autism spectrum). Even when I'm with my friends or family, I still feel very alone. But I feel much less alone with my cat. I've heard that's not uncommon.
Please don't make the mistake of thinking Aspies can't feel. I feel very strongly and very deeply. But I do have difficulty expressing those feelings. But ironically I'm also very affectionate. *shrug*
I'm not sure if this is universal, but I consider Aspergers an important part of my identity. I wouldn't want a "cure" if there was one; it's part of who I am. There are difficulties, sure, but it also gives me an "outsider's perspective" on life that I find invaluable as a writer--plus that "Aspergers memory" is pretty handy, too. This hasn't always been the case; there were times, especially as a teenager, where I felt it would have been nice to be "normal." My mom didn't want me stigmatized so she encouraged me to keep quiet about my Aspergers, but as an adult I've found it something to be proud of. Not that I go around announcing it to everyone, but if it comes up (like here) I certainly don't mind talking about it.
If you have any more specific questions I'd be happy to answer about my experience--like I said, everyone experiences Aspergers and autism differently, but I can at least tell you how I experience it. Only thing I couldn't really answer is how Aspies relate to each other, since, as I said, all my friends are NT.