Yes. Press the BlackBerry menu key and select 'Find' (or just press 'F' on most BlackBerry models).

You can also use common BlackBerry keyboard shortcuts to navigate the list, including:

• 'F' to Find
• 'T' to go to Top of list
• 'B' to go to Bottom of list
• Space bar to go down one page
• Shift-Space bar to go up one page
• 'R' to refresh the contact list

Note that shortcut behaviour may vary by BlackBerry model; consult your user's manual.