Why should you care about yet another forum? Good question.
From the StackOverflow FAQ:
So What? Who cares? Isn't this just like a dozen other websites?
What's so special about this? Well, nothing, really. The only unusual thing we do is synthesize aspects of Wikis, Blogs, Forums, and Digg/Reddit in a way that we think is original.
Super User is that tiny asterisk in the middle, there.
But hopefully you'll see what we mean when you participate and experience it for yourself.
To gain reputation, post good questions and useful answers. Your peers will vote on your posts, and those votes will cause you to gain (or, in rare cases, lose) reputation:
A maximum of votes can be cast per user per day, and you can earn a maximum of reputation per day (although accepted answers and bounty awards are immune to this limit). Also, please note that votes for any posts marked "community wiki" do not generate reputation.
Amass enough reputation points and Super User will allow you to go beyond simply asking and answering questions:
† you can always comment on your questions and answers, and any answers to questions you've asked, even with 1 rep.
Another reason that this site is great is that it doesn't try to be everything to everybody. Stack Overflow only aims to answer questions relating to programming. What kind of questions, you ask? Yet again, the FAQ comes to the rescue:
What kind of questions can I ask here?
Stack Overflow is for professional and enthusiast programmers, people who write code because they love it. We feel the best Stack Overflow questions have a bit of in them, but if your question generally covers …
… then you're in the right place to ask your question!
Please look around to see if your question has already been asked (and maybe even answered!) before you ask. It's also perfectly fine to ask and answer your own question, as long as you pretend you're on Jeopardy: phrase it in the form of a question.
What kind of questions should I ask here?
Avoid asking questions that are subjective, argumentative, or require extended discussion. This is not a discussion board, this is a place for questions that can be answered!What if you have a different type of question, or a question about the site itself? Well, they've thought about that, as well. There are actually a whole family of inter-related sites, each serving a very specific purpose. Quoting the FAQ again:
If your question is about …If you have a question or comment about the site itself, each of the sites has a "meta" section that is separate from the actual questions and answers. This allows people that are only interested in the questions and answers to avoid site-related questions, complaints, and discussions. This doesn't seem like a big thing, but as a former forum admin, it's refreshing to know what to expect when you browse the site.
In addition to Stack OverFlow, Server Fault, Super User, and Doctype, there are quite a few subject specific sites available in the StackExchange Network, such as http://cooking.stackexchange.com/ and http://bicycles.stackexchange.com/ .
I am not on every StackExchange site, but if you're looking for me, look for Zoot. I recently started up an account, so my scores are pretty low, but in time, that may change.