Another cool, useful tool by Google. Personalized search engines allow you to define the topic being searched as well as the sites indexed.

I present to you my 1st two search engines, the Islamic Search Engine:

, the Famous Search Engine of Food and Recipes:

, the Telecommunications Search Engine:

and now the Mobile Device User Agent Profile (UAProf) Search Engine:

The actual searches can be found on the right hand side panel under the usual Google search widget.