No matter what 'job' you need to do, you need good tools.
These are tools that I find helpful - and I'm a reasonably prolific writer.
Some are 'old fashioned' and others are new-fangled.
Use what works for you, but know that I highly recommend the following:

1. A good computer with decent internet connection.
   Although you don't have to have a computer to write, and in fact, are sometimes better getting away from your computer to write, other times, you really need the power that a decent computer offers you - and you don't want to hassle with dial-up or intermittent internet access.
   Since I spend a fair amount of time traveling and doing workshops - I spend a lot of time in hotel rooms.
   This is good because I can get a lot of uninterrupted writing time in hotel rooms.
   However, if the internet connection is dreadful, I have to just give it up and write without checking certain sources or fixing words or whatever because the 'hassle' factor is too high.
   When you're in your main writing space, invest in a computer that serves you - and high speed, reliable internet.
   
2. Good paper, good pens, pencils, markers, or whatever it is that you like to write with and on.
   Hmmm...
   Although I would write on nubby, cheap paper with a ratty pencil or pen if I had to rather than not write, it's worth it to get 'the good stuff.
   '
3. Digital recorder.
   Many people feel quite comfortable talking but despair when asked to write.
   If this is the case for you or if you just sometimes feel like talking instead of 'writing,' use a digital recorder to capture your ideas, your sentences, your paragraphs, your questions and answers, your interviews, or anything else that will lead to the articles, chapters, or books you are writing.
   
4. An easily accessible thesaurus, such as www.
   MyFavoriteThesaurus.
   com.
     I write so much that I don't want to be using the same words over and over - so looking a word up here generally gives me an array of options.
   I don't think there is a day where I don't consult this amazing tool.
   
5. Timer.
   If you are an avid writer, you may need to use a timer to remind yourself to get up, stretch, get some air, or go to a scheduled meeting.
   If you are currently a 'reluctant' writer, you can use a timer to keep yourself on task for a specified period of time, say, 30 minutes.
   Writing 30 minutes each day for a year means you will have written for over 180 hours.
   Imagine that if you can type 50 wpm, you can potentially capture 1500 words in 30 minutes.
   If even half of that is usable, you will have 135,000 words in a year.
   Since the typical typed manuscript page is 250 words, you will have written 540 pages, which could easily translate to 260 pages in a book.
   Do the numbers.
   30 minutes a day could equal a book each year.
   Get out your calculator.
   Use a timer to keep yourself writing for at least 30 minutes each day.
   

We all get stuck sometimes - and if you just need a little something (or a big something) to get yourself moving again, give one or more of these ideas a try.
  What have you got to lose?