We just got word of this from the IRS. Treasury also issued a Fact Sheet as guidance, but I am not techie enough to post the pdf file here. Sorry.

IRS Says Stimulus Payments Will Be Sent Automatically Starting in May
Posted Feb. 13, 2008, 2:45 PM ET

The Internal Revenue Service Feb. 13 said it would send stimulus payments automatically starting in May, adding that eligible taxpayers must file a 2007 tax return to receive a rebate.

In a news release (IR-2008-18), IRS said in most cases taxpayers will not have to do anything extra to get the payments under the economic stimulus package, signed into law today by President Bush.

"If you are eligible for a payment, all you have to do is file a 2007 tax return and the IRS will do the rest," acting IRS Commissioner Linda Stiff said in the release.

IRS also issued two fact sheets with more information on the stimulus payments, one with general information (FS-2008-15) and one with information specific to low-income workers and recipients of Social Security or certain Veterans' benefits (FS-2008-16).

Text of IR-2008-18 is available at http://op.bna.com/dt.nsf/r?Open=csaz-7bsqmn.

Text of FS-2008-15, Facts About the 2008 Stimulus Payments, is available at http://op.bna.com/dt.nsf/r?Open=csaz-7bsqud.

Text of FS-2008-16, Stimulus Payments: Instructions for Low-Income Workers and Recipients of Social Security and Certain Veterans' Benefits, is available at http://op.bna.com/dt.nsf/r?Open=csaz-7bsqv4.