PMHUB is a Professional PM Communities comprising of more than 70,000 Project Managers, Project Leaders and Program Managers.  Please read also Wikipedia article on PMHUB

PMHub (since 2005 )has 4 prong solutions  in its mission to help Project Managers to upgrade their professional skills:

• This PMHub.net web site provides additional info and links to important PM info and at the same time provide  PMDigest- a digest of all basic information that you need to know to pass your certification. PMHUB Blog covers longer articles on PM general and ceritication matters
  
  
• PMHub Forums (45,000 members): extends PMHub@yahoogroups.com to meet the needs of PM world, PMP and PMP aspirants for a PM hub. Not only PMP issues are discussed, but also real world PM, Country issues, Study clubs, Job Boards, Vacancies, salary, review of books/articles, Buy& Sell etc. We have expanded from a mere PMP Preparation group to a PMHub. With membership approaching 65,000, it is arguably largest PM communitiy
• New! PMHUB Googlegroups: pmhub@googlegroups.com - starting Feb, 2, 2007 with more than 5,000 members
  
• PMPHub@Yahoogroups .com, originally called PMPCERT – is now the largest global PM group on the web with more than 19,500 members. This Yahoogroups is now used only for annoucements and PMI news
  

To comply with PMI, the name PMPCERT is no more in use, it is replaced with PMHub in August 2005.

What a reviewer wrote about PMHUB:

"This group  is a great resource for anyone that may be interested in Project Management Certification or Project Management Study.  This group has over 15,000 members and over 21,000 searchable posts averaging over 300 posts a day. 

This group’s webpage also provides links to training pages to  prepare to sit for a certification test and full length articles ranging from emotional intelligence to virtual teams to ISO 9000 quality management. 

The homepage also has a forum with a “Lessons Learned” section where people that have sat for the certification can post information about the experience. 

There is potential to have bulletin board type conversations with people from around the world with the message board having an area for what is called “Water Cooler” talk.

 I think that this is a great group and website for anyone that is interested in being a project manager or for anyone that suddenly finds themselves in a situation where they are in charge of a project and would like some additional information about how to handle a situation."

Robert Schlutz, Spring 2006 in Electronic Discussion Reviews (University of Iowa)
http://www.cba.uni.edu/buscomm/ElectronicComm/ListofLists.html

PMHUB is recommended by:
Boston PMI Chapter/PMI Mass Bay Chapter
Boston University Library

PMI -  ISSIG  

" useful site for those who are preparing for the PMP Exam, You can find 47 series video lessons to study  the PMBOK 3rd edition, PM articles, and PMP exam lesson learned "

PMI South Florida Education and Certification 

 PMP Distilled

Procept:
www.PMHub.net: One of the best sites.
 
Korean PMPCAFE
Since I cannot understand Korean, I cannot say what is the comment on PMHUB there, but needless to say that it is very positive. Every day, now there are at least 20 visitors from Korea

PMI-Mumbai:

http://www.pmi-mumbai.org/resources.htm

Germany’s PM webpage, PMQS.de

Chinese PM weblog of Michael Chuang
Spent 1 hour per day to walkthrough NEWS group PMHub@yahoogroups.com and www.pmhub.net

and another one
http://blog.yam.com/rhoda/archives/981362.html

Chinese Blog: Cheng-Min Chang (PMP)

and

http://blog.naver.com/post/postList.jsp?blogId=pnk1026&categoryNo=28&cpage=2&viewdate=

Taiwan’s PM,  Y Liu website:
"PMHub.net [pmhub.net]
The most useful resource for PMP preparation on the WEB"

 Edwin Chan's weblog:
 http://edwinchan.wordpress.com/2007/06/08/pmp-exam/[/url]


"The online forum pmhub.net is the most helpful web site for studying PMP. It contains plenty of exam advices from other PMP exam takers, along with Jim Owens’ study notes which discuss a variety of topics that typically appears on the exam."


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PMHUB is a registered trademark

PMHUB current sponsors: PMI, PMTI, TSI, Crosswind, RMC Project, PMStudy, Bellevue University & PMPrepcast, PMSuccess, FACT.co.nz and PMPerfect.com