I am collecting some BA online resources here, hope it helps. check it out first, and I will add some brief explanation later.

http://www.requirementsnetwork.com
http://www.theiiba.org
http://www.b2ttraining.com/page/Business-Analyst-Blog
http://www.bainsight.com/
http://www.volere.co.uk/index.htm
http://www.agilemodeling.com/
http://www-128.ibm.com/developerworks/rational/rationaledge/archivedate.html
http://www.b2ttraining.com/page/ba-downloads
http://www.bpmg.org/
http://www.softwareprojects.org/software-requirement-management-01.htm
http://www.brcommunity.com/index.php
http://www.processimpact.com/index.shtml