With computer ownership in the U.S. hovering somewhere around 80%, it's easy to forgot that there was a time not too long ago when people had no idea why they would need a computer in their home. The onus then fell to the computer companies to inform a nation of potential customers why they would need a bulky, hot, and loud machine in their living room. They did this primarily through advertising. Duh. As many people believe we're entering a "post-pc" age, you seldom see ads advertising computers or computer programs. However, back in the day they were everywhere. Like all ads, some were good, funny, informative, and slightly ridiculous, while others were vague, dry, and slightly ridiculous. We picked 30 of our favorites for you to breeze through. Take a trip down back in time to see how things were before the banner ad.