Following pressure from the House and Senate, BP has released high-resolution footage of the oil leak. The video below is from June 3, so before the containment dome was placed over the broken pipe.
Ecopolitology reports that the latest estimates on the amount of oil still leaking from the broken Deepwater Horizon wellhead in the Gulf of Mexico put the flow rate at a minimum of between 12,000 and 25,000 barrels per day. However, this estimate is not based on the high-res video from BP. Once scientists get a chance to analyse this footage, it's likely the number will be even higher.