Understanding Google Apps Marketplace in ten steps

Google has opened its doors of Apps Marketplace to the masses. While news are rolling around and RSS feeds are getting darker about this, I thought it will be helpful for those who want to do use the shortcut to understand the basics of this platform. So here's my Google Apps Marketplace facts in 10 steps.

Remember this person?

This picture is from GuideBookGallery, a site which belongs to Marcin Wichary. It simply reminds me of early computeched days of life. It's almost 25 years from now and I just can not think of what people were doing without so much tech gadgets.