Beware of tax-bracket creep: If your income last year was close to moving to a higher bracket and it hasn't changed significantly, you may find yourself in a higher bracket this year because of indexing. This could make the various tax-reduction strategies even more important to you.
Change in personal situation: Have you had a change in your life this year? Perhaps a marriage, a divorce, the birth of a child, or a death in the family? If so, you should consider meeting with your tax advisor before the end of the year as there may be advantageous tax strategies applicable to you in your new situation.