In my estimation, the GPL is by far the world's best open-source license for business. If Palamida's recent count of GPLv3-licensed projects is any indication, business in open source is very, very good:
Our database now contains over 2,000 projects that are using the GPL v3. At this rate the GPL v3 is being adopted by 1,000 projects every 4-5 months, and if the trend continues, the license will be used by 5,000 projects by the end of the year.
It will take time for GPLv3 to achieve the same level of trust that GPLv2 has enjoyed, but at this rate it may be happening sooner rather than later.
In the meantime, Palamida, a request: Could we get a count on the number of projects using the Affero GPL (AGPL)? It will be miniscule today but I'd be interested in following its growth.