Christoph Murauer, one of the many ClamAV and Snort users in the community has written Snort User guides for Lion which we've linked to before over on the Snort blog.
This time Christoph has written a guide for using ClamXav and ClamAV on OSX Lion 10.7. If you are interested in Antivirus protection for on OSX in any way, I suggest a read of his guide.
Check out the article here.