Sometimes, documentation isn’t always enough to learn about APIs. We need examples that I can play with. That’s why Ben Lisbakken released AJAX API Playground for teaching developers how to use Google’s JavaScript APIs.

The AJAX APIs Playground is currently loaded with over 170 samples for 8 Google JavaScript APIs (Maps, Search, Feeds, Calendar, Visualization, Language, Blogger, Libraries and Earth) that you can edit and run to help you explore what Google’s APIs have to offer.

There are also save and export features. The save feature allows you to hold onto an edited sample so you can continue working on it later, while export lets you modify a sample and publish the code to a permanent url.

Source: AJAX API Playground