You've heard about Spotlight, Apple's superfast Mac OS X search technology, but maybe you haven't yet discovered its special features. This quick lesson can help you get started. First, click the Spotlight icon (the magnifying glass) in the top right corner of your screen.
Type your search term in the text box that appears. Spotlight will immediately begin to list all files on your hard drives that match your search term. You'll notice that Spotlight lists the matches in categories, such as Applications, Folders, Images, Documents.

If you click "Show All" at the top of the list, a separate pane will open and you can further sort and narrow your search findings. You can group your matches by kind, date, or authors (people) and then further sort within groups by more categories.

But perhaps that's not narrow enough for you. You can be even more selective by deciding when the file was created and on which drive it's located if you have more than one hard drive. You'll now have a concise listing of all files that contain your search term and you can easily open any file by simply double-clicking on the name of the file.
In Mac OS X 10.5, if you click "Show All" at the top of the Spotlight pane, Spotlight will display all of the results in a Finder Search Results Pane.