Lifehacker has an interesting blog post on the "Top 10 Google Products You Forgot All About" that includes stalwarts like Google Trends and Google Alerts and a few others that may not be quite so familiar like Google Personals, Google’s WYSIWYG web site creation tool, and Flight Simulator for Google Earth.

10. Google Code Search – click here

9. Google Base – click here

8. Google Trends – click here

7. Google Alerts – click here

6. Google Book Search – click here

5. Google Page Creator – click here

4. Google Notebook – click here

3. Flight Simulator in Google Earth

Ok, so Google doesn’t make a flight simulator, but they do hide one in the latest version of Google Earth. Download Google Earth 4.2,
and to enter flight sim mode, hit Ctrl+Alt+A (Mac users: Cmd+Opt+A),
choose your plane, airport and runway. Google Earth’s flight simulator
isn’t a walk in the park for newbs, so here’s more info on how to take off and navigate the friendly, virtual skies.

2. Keyboard Shortcuts Experimental Web Search – click here

Google is always experimenting with new features aimed at improving the search experience.

1. Google SketchUp – click here

Whether you want to design a dream home, the world’s tallest building
or just a new backyard deck, Google SketchUp makes visualizing and
communicating your design ideas easy.

Via Lifehacker