Honestly, I think this was just Lifehacker’s excuse to use the Double Rainbow song. Either way, the song is awesome and Google Instant is awesome. I certainly can’t wait til they make it native in Chrome.

Google Instant Shortcuts
Tab/Right arrow = selects the first suggestion
Up/Down arrow = selects a suggestion from the list
Right arrow while selecting a suggestion = I’m feeling lucky
Enter or Esc = ignore the suggestions and find the results for your query