Search 1.0 is a smart app for the iPhone available free via Cydia (Author Edward Choh). This little one allows you to search anything inside your Mail, Notes, SMS & Contacts or simply search the Web (Web search is actually Google Mobile Search). Just select the tab to search on the bottom of the App, type in the search text on the search bar on the top, and hit search. The app also displays searched keywords highlighted in the results (for Web only).
Cydia is an Installer alternative, that Installs on Jailbroken iPhone 2.x… Info here