Google Scribe extension now available for Google Chrome
Either way, I still find that Scribe just isn't all that handy for competent, speedy typists. You'll have moved on to your next word long before suggestions ever appear in most cases.
For Chrome users who type at a more modest rate of speed, however, the Scribe extension may very well be worth installing. If you find autcomplete helpful while texting on your cell phone, Scribe is probably right up your alley.
One gripe: the default activation hotkey is Ctrl+J -- which is the same sequence used to access Chrome's downloads page. How about making this customizable, Google?
One additional gripe: if you're typing into a field which already auto-suggests (such as tag fields on various Web apps like wordpress), Scribe could give you some grief. Make sure you turn it back off before typing in such fields.
Bonus points to the commenter who submits the most LOL-worthy comment created entirely with Google Scribe!