Steven J. Vaughan-Nichols wrote an alaysis of Ubuntu's strenghts and weaknesses in the enterprise market. He praises Ubuntu for a flexible licensing model (you don't have to purchase a support for every server you operate), growing support from various software (Sun, IBM, SugarCRM and others) and hardware vendors (rumors of Dell offering Ubuntu laptops in the near future). He notes however, that Canonical still needs to work in some areas, especially administration tools.