Here are some of the reference materials for Flex-Maven integration:
Maven - Eclipse (Nice)
http://www.sonatype.com/books/m2eclipse-book/reference/index.html
Maven Build (Nice)
http://www.sonatype.com/books/maven-book/reference/public-book.html
See : Chapter 20 article regarding flexmojos
Maven - Flex - BlazeDs - Spring
http://www.scribd.com/doc/6040972/Tutorial-setup-Flex-project-with-Maven
http://riadiscuss.jeffmaury.com/2008/09/maven-and-flex-builder-tutorial-part-i.html
http://riadiscuss.jeffmaury.com/2008/09/maven-and-flex-builder-tutorial-part-ii.html
http://riadiscuss.jeffmaury.com/2008/10/maven-and-flex-builder-tutorial-part.html
Flexmojo repo : http://repository.sonatype.org/content/groups/public
Maven Dependency FAQ
http://wiki.community.objectware.no/display/smidigtonull/Maven+Dependencies+and+Build+Stability+FAQ
--Varun