The idea is to set a goal for the month and then work to make it happen. There are 128 participants in the event this year, which means lots of support and advice if you need it. And it's a lot of fun, too. This is my third Write-a-thin. The first year, I wrote part one of Sweet Auralie. Last year, I wrote a chunk of a new book called The Fall Line. This year's goals include giving the Fall Line a final polish now that it's finished and sending it off on submission. I'm also planning to add 5000 or so words to the book I'm writing.
So far, I'm nearly done with The Fall Line polish, which I'd hoped to have done the first half of the month. So, I'm ahead of schedule. Not too shabby. :).
If you write women's fiction, you may be interested in joining WFWA and maybe I'll 'see' you at next year's Write-a-thin. Here's the website link: http://womensfictionwriters.org/index.php