From a 2+2 thread:

However, the Congressional Review Act has this clause:

"...any regulation finalized within 60 days of congressional adjournment — Oct. 3, in this case — is considered to have been legally finalized on Jan. 15, 2009. The new Congress then has 60 days to review it and reverse it with a joint resolution that can’t be filibustered in the Senate."

As Politco sums up:

"In other words, any regulation finalized in the last half-year of the Bush administration could be wiped out with a simple party-line vote in the Democrat-controlled Congress."