Economic recovery payments of $250 will be sent to more than 52 million persons currently receiving Social Security and Supplemental Security Income (SSI) benefits beginning in early May 2009 and continuing throughout the month. Get the details on these payments.
Also See: 2009 Economic Stimulus Bill: How it Could Affect You


Comments
You are part right on the one time $250.00 payment.
I found out the hard way, if you and your husband are collecting SSD and SSI (my husband receives SSD and SSI, I only receive SSI), you will only receive one $250.00 payment.
I received nothing for being on SSI.