Concluding that "Launching a new gTLD is not for the faint of heart," ICANN provides a thorough evaluation of the introduction of the .aero, .biz, .coop, .info, .museum, .name, and .pro gTLDs:

Evaluation of the New gTLDs: Policy and Legal Issues, August 31, 2004

An executive summary of the 150 page report is available here.