This morning I was doing some cleaning of my Bookmarks bar in Chrome, when I came across a forgotten Bookmarklet - Google Scribe. It looks like the Scribe Lab program has since graduated and been rolled into Blogger's 'Draft' program, which is where I'm trying it as I type this.
On my phone, I use Swiftkey, which works in a similar manner; I start typing a word, and the program suggests not only the completion of the word, but as soon as I type space, it suggests the statistically most probable next word.
Kind of freaky, but highly effective on my phone at least. It's also interesting to see what it thinks I should be writing. Example: I will type a word and let Scribe choose next ones: Suggested words and word completions are highlighted:
The first day of the week and I have to take a break from the past to the future of my children.