Google Web APIs - What would you create?

[HtchHikr]

"Develop Your Own Applications Using Google"

http://www.google.com/apis/

Seems like you could develop a lot of apps with Google as your database.

Here are some ideas Google came up with:

• Auto-monitor the web for new information on a subject
• Glean market research insights and trends over time
• Invent a catchy online game
• Create a novel UI for searching
• Add Google's spell-checking to an application

What other ideas do you have?