Open Source Business: still searching?

As also mentioned during the first ERP session organised by Profoss, lots of open source companies are still searching their definitive business model. This is again put forth by an article from Stuart Cohen (former CEO of Open Source Development Labs) in BusinessWeek. His point is that support businesses are not sustainable because open source software is of great quality. Quite a big shortcut I think, but it has the benefit to have generated an interesting discussion on slashdot.