Harvard Business School Director’s Blog
http://www.hbs.edu/mba/admissions/blog.html

Kellogg School of Management
http://www.kellogg.northwestern.edu/programs/fulltimemba/applying/admissions_blog.aspx

UC Berkeley Haas School of Business
http://berkeleymba.blogspot.com/

UCLA Anderson School of Management
http://mbablogs.anderson.ucla.edu/

Wharton MBA Admissions
http://engage.wharton.upenn.edu/MBA/blogs/mbaadmissions_blog/default.aspx

Stanford MBA Admission Blog
http://www.stanford.edu/group/mba/blog/

Chicago MBA Admissions Blog
http://blogs.chicagobooth.edu/boothinsider

Ross School of Business
http://rossblogs.typepad.com/admissions/ 

School-Hosted Student Blogs:

London Business School
http://blog.students.london.edu/

MIT Sloan Student Journals
http://mitsloan.mit.edu/mba/experience/journals.php

Wharton Student Diaries
http://diaries.wharton.upenn.edu/

UC Berkeley Haas School of Business
http://berkeleymbastudents.blogspot.com/

UCLA Anderson School of Management
http://mbablogs.anderson.ucla.edu/mba_students/

Yale SOM Community Blog
http://blogs.som.yale.edu/index.php

Note: The Tuck School of Business offers a blog for which both students and admissions officers contribute.