Nothing is official, but here is the unpartisan recap of the most-discussed scenario:
Bush wants to offer an 'economic stimulus' package in the hopes that increased spending will soften the blow of the failing economy. It has been proposed that this can be accomplished by "eliminating" the 10% tax bracket. This tax bracket is 10% of the first $8000 earned ($16,000 for couples). Eliminating the bracket would give single filers an $800 credit and married couples $1,600. Checks would be issued to all filers for $800 or $1,600. It would basically be an 'advance' on the first $8,000 or $16,000 of 2008's tax bill. It's like bumping up the brackets (or eliminating one) on the 2008 tax return, but they want you to have the money NOW, so they cut you a check.
Congressional Dems are, for the most part, on board so long as the checks are mailed to EVERYONE, including those who pay no taxes or are under the minimum tax thresholds. Since the plan is, legally, an advance on 2008's tax bill, it must include a provision for non-tax payers or they will not support it.
Recap- it's NOT for a 'priveleged few', and it technically does not have to be 'paid for' b/c legally it's just a commitment to not collect that money in the future. It's almost like a loan forgiveness, with an advance payment.
Oh, and this is a non-partisan recap. I will not say if I do or do not support the plan and hopefully my writing was neutral so as to not emotionally affect others.