Sep 9, 2010 08:17 GMT  ·  By

Google has just introduced one of the most radical changes to the search engine since it launched. Google Instant, which serves search results as you type, looks impressive and certainly has potential but, for all of Google's testing and analysis, there are still plenty of questions that only time will answer.

In the meantime, Google is making sure to promote the feature, though Google Instant is pretty much impossible to ignore. During the initial presentation, Google ran a video ad for the feature, which is available on YouTube, unsurprisingly.

It features Bob Dylan's famous 1965 song "Subterranean Homesick Blues" along with the highly recognizable video. While the video itself is a great choice because of its rather universal appeal, the flash cards make it a great fit for Google Instant.

The Google ad features the original video intertwined with Google Instant in action. As the searcher types portions of the lyrics, Google Suggest completes them and presents the results before the user has even finished the query.

Google hasn't done much advertising for its products and especially not for the search engine. In fact, it has only run one TV ad, earlier this year during the Super Bowl, the Parisian Love video part of the Search Stories series.

Interestingly, that video first hit YouTube and was aired months later on TV. Google may choose to do the same with the Bob Dylan ad as well, it's certainly interesting enough for TV.

Google is, in fact, already advertising Google Instant, though using a more modern means, Promoted Tweets. It hasn't bought a Promoted Trend as well, but it didn't have to, Google Instant is already a trending topic on Twitter.

The Bob Dylan video is already inspiring others. From the same ad company that brought you Pulp Fiction Wave, there is now a video based on Tom Lehrer’s “The Elements” which makes ample use of Google Instant.