Improvement frameworks
Listings of process areas (and requirements under those process areas) useful for harvesting ideas and demonstrating compliance with key improvement frameworks (aka 'maturity models') which are used by various industries
COBIT
IT Generic Processes and Governance Guidelines by the IT Governance Institute.
ISO 17799
A detailed security standard organised into the following areas: Business Continuity Planning, System Access Control, System Development and Maintenance, Physical and Environmental Security, Compliance, Personnel Security, Security Organisation, Computer & Network Management, Asset Classification and Control, and Security Policy.
ITIL
The IT Infrastructure Library is a set of best practices for IT service support and delivery built by the UK government. It consists of 6 sets: Service Support; Service Delivery; Planning to Implement Service Management; ICT Infrastructure Management; Applications Management; and The Business Perspective.
PEMM
Process and Enterprise Maturity Model
SSE CMM
Capability Maturity Model for Security Systems Engineering
CMMI
SEI's Capability Maturity Model for systems and software engineering
PMBOK
The core elements of the assessment model for organizational maturity, for the Project Management Body of Knowledge, developed by the Project Management Institute.
User-submitted
A grab-bag of member-submitted ideas for best practices (rather than integrated framework) that aren't called out in other frameworks, but have proved useful