If your startup has eclipsed "Doogie Howser" in Google Trends, you can feel satisfied that you've crossed the first line and are well on your way to becoming a household name.
For example, Posterous passed the Doogie Houser test in mid-2009:
http://www.google.com/trends?q=posterous%2C+%22doogie+howser%22&ctab=0&geo=all&date=all&sort=1
And Mint.com in late 2007:
http://www.google.com/trends?q=mint.com%2C+%22doogie+howser%22&ctab=0&geo=all&date=all&sort=1