Roll Call reports that H.R.811 "the Voter Confidence and Increased Accessibility Act of 2007" had run into trouble in the Rules Committee. That committee is responsible for setting out how a particular bill will be considered in the Chamber - deciding the conditions for debate and whether amendments can be taken. There is an excellent explanation of how these 'special rules' work at http://www.rules.house.gov/POP/specialrule_is.htm
The Committee met on Wednesday, but adjourned without a Rule being agreed. Roll Call report that "Slaughter said Thursday that the bill was being reworked to address Member concerns, and said it could come to the committee as early as Friday morning and to the House floor on Monday."