According to ESPN, It's 6 years at 69, 31 guranteed. Holy bovine mother of god.
Quoted from the article:

The deal is expected to be announced at an 11 a.m. ET press conference on Tuesday and was primarily negotiated on Romo's behalf by agents Ken Kramer and Tom Condon.
None of the principals could be reached for comment.
By signing him to a new deal before Nov. 5, the Cowboys will be able to apply some of this money toward their 2007 salary cap. -Oops, go ahead and delete. I looked at Miles' diary and my reactions made me ignore it in disgust upon seeing Britney's name.-