I wrote a long response and MDC lost it with log in. Hmph!
To answer the questions:
I write mostly short, personal, creative non-fiction articles and book reviews. I write directly into my laptop unless I'm away from my 'puter, then I use pencil and paper, but I prefer to 'word process'.
I save all my work in digital format in my 'puter and back them up regularly so nothing can be lost. I regularly rework old articles to keep them fresh and up to date. I may publish them in a book one day or perhaps polish and expand them for a more widely distributed publication than the one I write for (voluntarily - I don't get paid).
I'm about to embark on a larger writing project with two other writers. Co-authoring will be a new experience for me. Even though it will be non-fiction I might adopt the index card system or try a ring binder. There's no substitute for reading work on paper sometimes.
I am new to this writing gig and have only been doing it for a few years and since becoming a mother. So I haven't done any courses yet - although I intend to as soon as my baby daughter can be left for a day or a weekend. More recently I've subscribed to a few magazines/journals that help me analyse my writing and improve. It would be great to have a writers group but our family is too transient at this stage (we're Australians in the US until the end of the year).
I write surrounded by my kids and piles of laundry and dishes and constant interruption!
I guess that's why I haven't written anything more ambitious than parenting articles and book reviews yet. If I have a deadline to meet I write in the mornings on the weekends when my husband can mind the children.