The Nexus One includes applications, contacts, plus visited websites and bookmarks in its list of searchable items. You can customize the list to include your music, internet radio stations, note titles, etc. (depending on installed applications).
1. Go to the Home screen.
2. Select the Menu key.
3. Select Settings.
4. Select Search.
5. Select Searchable items.
6. Use the checkboxes to select and deselect the desired sources.