Interesting topic - I started a writing challenge last week: to commit a substantial quantity of words (not random ones

) in various literary forms to paper by the end of the year. I have produced 30000 words in the last 8 days mostly in 1000 - 2500 word chunks.
I have often found it helpful at various stages in the past few years to use Julia Cameron's "morning pages" exercise from her Artists Way
The Basic Tools - so that constitutes around 1000-2000 words a day, I'm using the "journal jar" concept to give me random topics to write about, and am hoping to write a book as part of it.
My head is usually swimming with hundreds of ideas, and my computer is laden with unread "free reports", newsletters and the like on a multitude of subjects, so writing really helps me clarify my thoughts - pin them down - and writing key points on the various reports etc is helping me figure out what value there is (if any) in them.