Free set of icons related to project management: http://www.smashingmagazine.com/2009/04/27/project-icon-set-for-free-download/
Free icons set called “Bright” : http://min.frexy.com/article/bright_a_free_icon_set/
More free icons set from the same author:
http://min.frexy.com/article/milky_a_free_vector_icon_set_part_1/
http://min.frexy.com/article/milky_a_free_vector_icon_set_part_2/
http://min.frexy.com/article/milky_a_free_vector_icon_set_part_3/
http://min.frexy.com/article/milky_a_free_vector_icon_set_part_4/
Free set of icons related to financial items: http://www.smashingmagazine.com/2008/10/09/finance-and-applications-a-free-icon-set/
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