Danish airspace was opened last night, but only if you were at high altitude (the weather crew on tv said the cloud is between 1500 and 11000 meters so I guess high altitude is above 11 km's).
Cimber Air had planned to send up one of their ATR42's to make a test-flight today but not sure if they've done it yet.
Other people have spent something like 20000 DKK just to get home from mainland Europe, including busses and taxis! Other people aren't so lucky, like danish tourists from various countries in Asia going home with the chinese airline and now all stranded in China with no place to stay or compensation apart from what the danish embassy rushed to provide, include temporary visas since China was just a stop on the way home with the plane. In USA KLM is refusing danish passengers any assistence now they can't get home (and that's directly against EU law since KLM is a european company), so all in all a lot of trouble still with that cloud.
Frank