-American Recovery and Reinvestment Act of 2009
Lots of great tax incentives and credits have been added in the ARRA including:

Making Work Pay Credit
A refundable credit for tax years beginning in 2009 and 2010;
Economic Recovery Payment
A one-time $250 economic recovery payment is available to eligible adults receive social security benefits;
First-time Homebuyer Credit
Expanded from 2008, the maximum credit for 2009 is $8,000 (up from $7,500) and is no longer subject to the recapture rules of the prior credit.
New Vehicle Sales Tax Deduction
Qualified motor vehicle taxes are deductible (even if you don’t itemize!)
Exclusion for Unemployment Compensation
Recipients of unemployment compensation are allowed to exclude from income up to $2,400 of benefits received in 2009. American Opportunity Tax Credit
Expanded education credit!
Alternative Minimum Tax (AMT)
Exemption amounts are increased – this is good for higher income tax payers!

There are several more credits and incentive available to individuals and businesses, take a look at the summary of the act posted by the National Association of Tax Professionals (NATP) here.

-Standard Mileage Rate Announced for 2009
The IRS has issued Revenue Procedure 2008-72 announcing the 2009 standard mileage rates. The optional standard mileage rate for business miles will be 55 cents per mile beginning January 1, 2009. The depreciation component of the standard mileage rate is 21 cents per mile. The standard mileage rate for medical and moving will be 24 cents per mile. The standard mileage rate for charitable purposes will remain at 14 cents per mile.