Snort_inline: good article in hackin9 magazine
William pointed me at a nice introductionary article in Hackin9 magazine about setting up and running Snort_inline in various scenarios. Written by Pierpaolo Palazzoli and Matteo Valenza. Worth a read!
http://en.hakin9.org/attachments/hakin9_6-2006_str22-33_snort_EN.pdf