Here is a huge list of Do-Follow Forums, You can use your signature links for link building…

http://www.sitepoint.com/forums/

http://acapella.harmony-central.com/forums/

http://forums.seroundtable.com/

http://www.submitexpress.com/bbs/

http://www.startups.co.uk/

http://www.v7n.com/forums/

http://www.webmaster-talk.com/

http://forums.comicbookresources.com/

http://bzimage.org/

http://www.clicks.ws/

http://www.earnersforum.com/forumsindex.php

http://www.acorndomains.co.uk/

http://forums.onlinebookclub.org/

http://www.ableton.com/forum/

http://www.davidcastle.org/BB/

http://6pins.com/blog/

http://iq69.com/forums/

http://forum.hot4s.com.au/

http://forums.mysql.com/

http://forums.cnet.com/

http://paymentprocessing.cc/

http://www.dnforum.com/

http://www.sitepoint.com/forums/

http://forums.seroundtable.com/

http://www.v7n.com/forums/

http://www.webmaster-talk.com/

http://paymentprocessing.cc/

http://webhostingtalk.com/

http://namePros.com/

http://www.webdigity.com/

http://www.lex224.com/forums/index.php

http://www.affiliateseeking.com/forums/

adobeforum.com

http://forums.seo.com/

http://forums.digitalpoint.com

http://forums.webcosmo.com

http://www.bodybuildingweb.net/forum/

http://www.webicy.com/

http://www.wareswapper.com/

http://forum.hittail.com/phpbb2/index.php

http://www.warriorforum.com/forum/

http://siteownersforums.com/index.php

http://www.webmaster-forums.net/

http://www.geekpoint.net

http://www.smallbusinessforums.org/

http://www.pakadtrader.com/forum/index.php

http://forums.ukwebmasterworld.com/

http://www.experienceadvertising.com/forum/

http://www.9mb.com/

http://bzimage.org/