750 words is really fantastic if you want to practice writing every day, especially if you want to practice writing quickly. The site keeps a live word count and pushes you to write 750 words (roughly three pages) every day by tracking your streaks and awarding badges for hitting certain milestones. On top of that, the site tracks how many interruptions you have while writing your 750 words and how long it takes you each day to write.
I had a 149 day streak broken when I lost track of time and forgot to write until after midnight one day, but I'm back up to a new 40 day streak. I was shocked to learn that I'm usually able to write 750 words in under 15 minutes, and on some days I like to push myself to try to write as quickly as possible (I've gotten as low as 8 minutes one time). Of course, writing quickly sometimes means writing somewhat lower quality, so I don't always "race the clock".
If you have any interest in improving your writing skills, I can't recommend 750words.com enough. I started less than a year ago, and I've written a total of 185,022 words that I probably never would have written otherwise! Of course, by writing so quickly I've spent only 56 hours writing on the site, so I have a long way to go before I reach the 10,000 hour mark.