I signed up for 750words.com. So far, I really like it. I like that the site sends you an email reminding you to write at a time you specify. I like the monthly challenges to write everyday. I like that it gives you points based on some algorithm. It hasn't been long, but I'm enjoying the site.
One of the features that I think will be really helpful is the stats page. It gives you an idea of the tone of your writing. It also shows you what words you've used most. I might run the risk of over analyzing on the stats page, but for right now, I find it quite helpful. I think I might also copy and paste a piece of writing just to see what the stats say. It might be a helpful editing tool.
I was doing pretty well with the site. I wasn't getting 750 words every day, but I was trying to write for at least ten minutes. Then my daughter came down with the stomach flu. She's two and a half. It was not fun. I also started feeling unwell. We're better now and luckily no one else in the household got sick.
I digress. Anyone who needs a little motivation or wants to find out a little more about their writing should check out 750words.com.