An interesting article (by @cloudpundit) from Gartner: Don’t Let OpenStack Hype Distort Your Selection of a Cloud Management Platform in 2012. The recommendations are not specific for OpenStack. The following table form the exact same article gives a nice impression of Garnter’s recommendations:
The second recommendation is probably most interesting: ‘Use a 3rd party cloud API library […]’ – Why not even go for an Open Community Standard Driven Cloud API? OCCI for OpenStack is the answer and an implementation deployed on the EGI FedCloud.