Just added to http://snort.org/docs, another awesome setup guide from the Snort community, covering the latest version of Snort (22.214.171.124) on OpenBSD.
I'd like to thank Randal Rioux for his guide, as I know that takes a lot of time to write up. We are always on the lookout for more setup guides, whitepapers, and how-to's from the community. If you are interested in writing one, please contact me, and I will help you in anyway I can.
joel [at] snort.org