If you have just read the Beginner's Guide, and you are interested in becoming more involved with the node.js community, this guide is for you.
IRC is a great place to discuss the virtues of vim vs. emacs, as well as getting support and interaction from people within the node.js community.
The official irc channel for node.js is located on chat.freenode.net and named '#node.js' (yes, the dot is part of the name). There are usually ~500 people in there these days.
If you have a question, just go ahead and ask it. Depending on who's awake and paying attention, you often get great replies right away. Otherwise just stick around and wait for an hour or so. After that it's ok to ask your question again, in case you think it went by unnoticed.
Oh, and you should always try to find your answer on the web first, but you know that, right?
A lot of discussion around node.js takes place via google group mailing lists. The two official lists are:
Since twitter cuts off tag names when it sees a dot character, many people use the tag '#nodejs' to highlight node.js related content on twitter. You can find the current stream of tweets via twitter's search function:
Since not everybody is tagging their content, the above query also includes results for the term 'node.js' itself.
If you are curious about the people driving the node.js development & ecosystem, here is a list of a few people whose names you should know.
Ryan is the creator, maintainer and BDFL of node.js. This means any commits that go into node.js are reviewed by him, and he's the only one who directly pushes to the node repository.
While Ryan will generally try to respond to questions on the mailing list and IRC, he's a very busy guy. So don't be upset if he doesn't answer your direct questions right away, there are usually other people around who can help as well.
Bert is the main developer working on windows support for node, and also one of the biggest overall contributors to the project.
Tim is the original author of connect, and has been contributing to node.js since the early days. He currently works for HP (formerly Palm), and is also known for the collaborative blog howtonode.org.
Yours truly, who is very active in the node.js core development, and works on projects such as formidable, mysql and this very guide. Besides node core development, I'm also the co-founder of a node.js startup providing file uploading & video encoding as a service called transloadit.com.
Mikeal is the author of request, and is very active in the development of node.js, as well as the community.
Marak who goes by the alias Jim Bastard, is mostly known for pumping out dozens of node.js libraries per month, an ability only exceeded by his artful use of profanity and trolling people. Don't get upset if he rubs you the wrong way, he's a nice guy, but you just shouldn't challenge him to a Monkey Island style sword duel.
Some of you may know Peter from his popular blog catomat.net. Together with James Halliday, he has recently started a node.js startup called browserling, which has also led to tons of open source modules from the two of them.
This list is by no means exhaustive and for most parts in random order. My goal is to keep this list short enough so it doesn't become a list of all node.js users, but there are probably a few important names that I forgot. So if you would like to see your name here as well, just email me.