If you've got a personal inquiry, or just want to say thanks, feel free to email me directly. But if you need help with Riemann, please ask via IRC, the mailing list, or via Github Issues. You'll have a better chance of finding someone who can answer your question, and there'll be a record that other people with similar problems can read later.
Riemann is a volunteer effort, and I need your help to make it happen! Join the IRC channel and mailing list. Use your experience to improve rough spots in the documentation. Help make newcomers feel welcome. Answer whatever questions you can. We're all in this together!
Hop over to irc.freenode.net and join #riemann. There are a bunch of experienced users in channel who can help answer questions. I'm usually active from 10:00 to 00:00, Pacific time. If you don't get a response right away, try to stay in channel--we all have to sleep sometimes, but try to answer questions in scrollback.
If you're asking a new question, or have to leave without getting an answer, check the channel logs. All kinds of useful stuff there!
The riemann-users mailing list is a good place to ask questions. Make sure to search the archives too; you might find an answer to your question from an earlier thread!
Riemann Issues tracks outstanding bugs, and you can ask for help, suggest a feature, or report a problem there.
You can mention @riemannio on twitter with feedback or questions.