Cisco ASA and PIX Firewall Logging > Analyzing Firewall Logs
http://www.ciscopress.com/articles/article.asp?p=424447&seqNum=4 notes about logging and long analyzing on cisco netsec devices (pix/asa)
Log
glTail.rb - realtime logfile visualization
http://www.fudgie.org/ OpenGL log visualization (ssh and tail) – pretty cool!!!