Hmm, doing this seems to be slower than actually writing a text.
I have several friends who use Google to as a first editor of their grammar by making sure that phrases they aren't sure are correct return lots of search results. This seems like a convenient way for them to streamline that process.
Looks like Scribe is only looking one or two words ahead, though - it's not actually checking what you've written, just throwing the Google Suggest box into your writing.