New Google tool: My Search History.
My Search History lets you easily view and manage your search history from any computer. This feature of Google web search enables you to find information you thought you lost. And over time, you’ll see an increasing number of relevance indicators in your search results that help you find the information you want.
You have to signed in to your Google Account to use this feature wherever you go. An additional bit of fun: try the handy calendar to check the level of your Google activity on a given day, or see related searches you’ve done over time.(via Google Blog)