New feature in iOS4 - predictive URL bar

What was the URL of that website that you liked just now? Can't really remember? But you remember some keywords from there? No problem!

Just type any keyword that you recall on the Safari's URL bar and some predictive URL results (based on your history, bookmarks and search engine) will be shown. Just tap on the URL that you like. See below for what I mean:

How would you rate the accuracy of the predictive URL results?