Quail is a real-time log viewing program that I wrote to support large files with color highlighting and search functionality. Quail also provides a front end to LogParser enabling SQL query support for your logs.
Update (2/25/2006): Fixed bugs around display issues, key handling, and file reload on log rollover.
Update (5/22/2006): Enhanced highlight feature and added load from non-working directory.
Update (10/1/2006): Launch external commands, and window positioning added.