1. There's a project management group on LinkedIn called The Project Manager Network - #1 Group for Project Managers . (The link is http://www.linkedin.com/groups/Project-Manager-Network-1-Group-37888?itemaction=mclk&anetid=37888&impid=&pgkey=anet_search_results&actpref=anetsrch_name&trk=anetsrch_name&goback=.gdr_1329167141843_1)

Here's the description: #1 Project Manager Social Media Group & Community on LinkedIn. Find PM jobs or a job in a PMO. Discuss methodology, management of projects. Research PMP certification, Prince2, CMMI, PMI PMBOK, RUP, Six Sigma, ITIL, IEEE, Agile & Scrum, Software, PDU career education. USA, Canada, UK, India, Europe.

2. I like using PBworks for project management communications. It works well - no glitches. It allows online collaborations on documents and notifications. You can get it for free. http://pbworks.com/

3. Smartsheet allows online collaboration on project management documents such as spreadsheets and gantt charts. You can email one row of data, and attach files. It's a paid service but there's a free 30-day trial. http://www.smartsheet.com/

4.Mindtools - has both free and paid tools and info including a quiz to help you assess your project management skills and knowledge. http://www.mindtools.com/pages/main/newMN_PPM.htm