A little habit I started a while back was based on the Morning Pages exercise which is writing 3 pages first thing in the morning. Writing continuously without pause. It is therapeutic on many levels and great way to strengthen your idea muscle (see Altucher Confidential).
A fantastic tool for doing this is 750words.com created by Buster Benson. I used it for quite a while and it's great and helps keep you motivated along with daily reminders.
But I like to catalog my writing a little differently and revisit ideas and topics. 750words.com is more about daily writing. So starting now, I've switched to using this blog space for the exercise. This is a Drupal CMS website and I'm using CKEditor with the word count plugin enabled so I make sure I hit my minimum target. WordPress editor has a default word count enabled as well. I like WordPress but I'm very proficient in Drupal and it was the path of least resistance by copying my company website and rebranding it for my personal use. I use the responsive theme layout called Bamboo created by @Highrockmedia. This means my sites look good on all screen sizes ranging from smartphones, tablets, and desktops.