To generate most effective backlinks here are the some do follow blogs and forum could be used for the commenting ,do remember only choose relevant category blogs only .Here is the list I used mostly for Blog commenting with high page rank above 5&6.

• http://www.burningbird.net
• http://www.educause.edu/blog
• http://moritzlaw.osu.edu/blogs/tokaji/
• http://dig.csail.mit.edu/breadcrumbs/blog/4
• http://amps-tools.mit.edu/tomprofblog/
• http://pressblog.uchicago.edu/
• http://blogs.nyu.edu/fas/dri/aidwatch/
• http://www.atsweb.neu.edu/math/cp/blog/
• http://delong.typepad.com/
  
• http://www.grokdotcom.com
• http://www.sirpi.org
• http://polygeek.com/
• http://www.currybet.net
• http://marlenescorner.blogspirit.com
• http://www.themallblog.com
• http://justagirlintheworld.com/
• http://www.socialtimes.com
• http://businessfinancemag.com
• http://incsub.org/awards
• http://news-libraries.mit.edu/blog/
• http://thinkbig.tamu.edu/blog/
• http://iq.harvard.edu/blog/sss/
• http://badgersabroad.wisc.edu/blog/
• http://simile.mit.edu/blog/
• http://www.accc.uic.edu/itl/
• http://elibrary.med.yale.edu/blog/
• http://salrc.uchicago.edu/blog/
• http://multimedia.journalism.berkeley.edu/blog/
• http://www.duke.edu/search/?q=collaborate
• http://www.educause.edu/blog/23266
• http://library.duke.edu/blogs/scholcomm/
• http://blogs.law.harvard.edu/blog/tags/news/
• http://livelyarts.stanford.edu/blog/
• http://lcls.slac.stanford.edu/Blog.aspx
• http://www.lib.unc.edu/blogs/morton/
• http://sns.cs.princeton.edu/blog/
• http://www.law.wisc.edu/blogs/wisblawg/
• http://www.stat.columbia.edu/~gelman/blog/
• http://lucian.uchicago.edu/blogs/bling/
• http://library.osu.edu/blogs/readaloud/
• http://www.johnson.cornell.edu/blog/student/
• http://www.mclibrary.duke.edu/blog/
• http://alg.umbc.edu/usaq/
• http://law.marquette.edu/facultyblog/
• http://www.rc.umd.edu/blog_rc/
• http://admissions.ncsu.edu/blogs/
• http://www.cerias.purdue.edu/site/blog/
• http://www.ic2.utexas.edu/blog/
• http://oregonstate.edu/admissions/blog/
• http://blog.lib.umn.edu/schwitz/healthnews/
• http://www.cardozo.yu.edu/Blog.aspx
• http://hirise.lpl.arizona.edu/HiBlog/
• http://blog.mycology.cornell.edu/
• http://crossroads.georgetown.edu/blog/
• http://ncsu.edu/redesign/blog/
• http://www.berklee.edu/guestbook/
• http://urbanext.illinois.edu/guestbook/
• http://chandra.harvard.edu/guestbook.html
• http://www.parent.umn.edu/guestbook.html
• http://www.stanford.edu/~dement/
• http://www.ctr.usf.edu/shotokan/guestbook.html
• http://cds.aas.duke.edu/about/guestbook.html
• http://smhp.psych.ucla.edu/guestbok.htm
• http://www.parent.umn.edu/book.cgi
• http://www.cnrs.edu.lb/guestbook.html
• http://fleethecube.com
• http://www.extrapepperoni.com
• http://www.currybet.net/
• http://www.brazencareerist.com/
• http://www.sirpi.org/
• http://sayanythingblog.com/
• http://links.org.au/
• http://www.midasoracle.org/
• http://blog.greens.org.nz/
• http://www.tvhe.co.nz/
• http://www.illinipundit.com/
• http://weblogtoolscollection.com/
• http://dag.wieers.com

Here you can find some of .edu links those are really priceless backlinks but it takes a lot of experience and depth to drill down it .

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Amol Pomane

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