Purdue Cytometry Discussion List .. Consider joining the Cytometry Mailing List for regular discussion on all kinds of cytometry related issues. Helpful for both new and seasoned Flow Cytometry users.
CYTO University .. CYTO U is a new initiative of ISAC, as it expands it's online applications for cytometry education. There are webinars, courses and cytometry meeting recordings.
Practical Flow Cytometry, 4th Edition (made available via Beckman Coulter website) Written by Howard Shapiro, widely regarded as one of the gurus of Flow Cytometery. Howard's book is comprehensive yet writes about complicated subjects in simple language.
Cytometry- The Journal for the International Society for Advancement of Cytometry.