2GC's Performance Management Resource Centre
One of the largest collections of performance management related, original, single-source articles, presentations, case-studies and FAQ answers on the web. It also hosts two useful databases - one listing about 150 PM related web sites, and the other listing over 50 PM software packages.

Valuebasedmanagement.net
Sources on Value Based Management: Creating Value: Strategy Shareholders Stakeholders Managing for Value: Balanced Scorecard Intellectual Capital Corporate Governance Compensation Measuring Value: Valuation Intangible Assets EVA CFROI Corporate Performance Management