Today's cool stuff is mostly for writers.
Do you know how fast you type? Here's a typing speed test that will tell you your wpm.
If you need to be a little more organized (and who doesn't?) here's 100 Free and Useful Web Apps for Writers.
The publishing industry uses several terms that you (probably) aren't familiar with. The lovely Jessica Faust has come to the rescue with a Publishing Dictionary.
Storybook is a neat little download. I haven't fully explored it yet, but I may use it for my next novel. Their website description reads: Storybook is a free (open source) novel-writing tool for creative writers, novelists and authors which will help you to keep an overview of multiple plot-lines while writing books, novels or other written works.
Blockbuster Plots has a simplified Scene Tracker, too.
Generators can help you get out of a writer's block, so of course I'll include them here. Serendipity has a slew of them, mostly geared toward fantasy and sci-fi, but useful for any writer. And just for fun, you can rearrange your text to see it in a new light using the Bonsai Story Generator.
And finally, if you need to spark your right-brain into working, try Right-Brain Writing Prompts.