ProjectConnections - know-how for people managing projects and teams
Project Manager Today - online version of the popular magazine
Project Magazine - The free on-line resource dedicated to practical project management.
MMP - specialist training and consultancy in PPSO
Dave W Farthing's Software Project Management - contains advice and links to all kinds of information about managing software development projects
Corporate Project Solutions - experts in Enterprise Project Management - see the September 2007 event for the presentation from CPS