Charitable donations can, at the organization's prerogative, be applied to the previous calendar year. If you are close the organization, they have the ability to do this, but you should be asking yourself if you really need the deduction for 2011, or simply overall.
On a grander scale, you should remember that reducing your taxes by undertaking a financial activity should only be a marginal concern.
Imagine, for example, that your marginal tax rate is 28%, and for purposes of this example does not change. If, for example, you had a home equity line of credit, you could simply choose to pay more or less interest (by holding a larger balance, of say $2000 at 5% interest for a year), and that would have an effect on your taxes. If you chose to pay $100 more in interest, you would in fact, reduce your taxes by $28. If that $100 in interest lets you do something that is important (maybe invest it, use it, whatever), than by all means, you should take the $28 in tax savings, thereby lowering your cost of using that money.
But, why would you pay a bank $100 just in order to avoid paying the federal government $28?
Any deduction, when your marginal tax rate is less than 100% will necessarily cost you more than the savings. (Tax credits are 100%, and so would be different).
The point is not that you shouldn't be looking for tax advantages, but rather that a tax advantage should never be the sole cause of an action. Funding your IRA has a tax benefit. By all means, you should do it - but do it for the retirement reason, not the tax reason. Going to college has a tax benefit. By all means, you should do it - but do it for the education, not the tax benefit. And, holding a mortgage on a private residence is probably the cheapest use of capital you will have access to - but again, do it because you want the house, not the tax benefit. The tax benefit is there should be a reward for activity the government wants to encourage, but should never be the sole reason for doing it.
If you're doing an activity already, and need to worry about timing, that can often be worked out. But remember that over time, it all comes out in the wash. Choose the deductions you are already doing, and you'll be maximizing your money altogether.