"Google recently celebrated its 10th birthday. As we participated in the festivities, we realized that we are coming upon another birthday: In just a few weeks, our very own Google Toolbar will be turning 8 years old. To celebrate, we wanted to take a few moments to reflect on its evolution over the past few years and how we've tried to make the web a better place for the hundreds of millions of people who use Toolbar."

http://googleblog.blogspot.com/2008/10/eight-candles-for-google-toolbar.html

Toolbar 5 for IE out of beta