Just a bunch of links to tutorials on using AsUnit and continuous integration with Flex Projects:

A post on AsUnit by one of it’s creators,  Luke Baye’s:
http://asserttrue.com/articles/2006/03/10/AsUnit25

An example of a simple TestRunner mxml (AS2):
http://asserttrue.com/articles/2006/10/05/flex2-mxml-project-support-in-asunit

Luke’s post on continous integration:
http://lukebayes.blogspot.com/2005/11/continuous-integration-with-asunit.html

A good tutorial about using AsUnit (but with only a Flash testRunner):
http://www.insideria.com/2008/09/unit-testing-with-asunit.html

Another good tutorial about using AsUnit:
http://www.insideria.com/2008/05/anatomy-of-an-enterprise-flex-10.html

Discussion of one team’s unit test framework requirements:
http://www.eyefodder.com/blog/2006/06/unit_test_frameworks_for_as3_a.shtml
Weaknesses and strengths of FlexUnit and AsUnit:
http://www.eyefodder.com/blog/2006/07/flexunit_asunit_deathmatch_res.shtml

Story of their use of Continuous Integration:
http://www.eyefodder.com/blog/continuous_integration/
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_1.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_2.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_3.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_4.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_5.shtml
http://www.eyefodder.com/blog/2006/05/continuous_integration_with_fl_6.shtml

A flash-oriented tutorial, but with good AsUnit explanations:
http://marstonstudio.com/2007/07/28/asunit-testing-with-flash-cs3-and-actionscript-3/