From Yahoo News:

This image taken from video provided by BP PLC at 15:57 CDT (4:57 p.m. EST), shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. BP finally choked off the flow of oil into the Gulf of Mexico on Thursday — 85 days and up to 184 million gallons after the crisis unfolded — then began a tense 48 hours of watching to see whether the capped-off well would hold or blow a new leak. Engineers will monitor pressure gauges and watch for signs of leaks elsewhere in the well