View MOSS 2007 or WSS 3.0 log files
From Richard's Wiki
To view MOSS 2007 or WSS 3.0 Log Files:
1) Goto: <root drive>:\Program Files\Common Files\Microsoft Shared\web server extensions\12\Logs
2) View Last Updated File.
Note: Log file will be updated continuously, so it is better to view in a editor such as textpad (www.textpad.com)
By default log settings are set to high priority logs.
To change log settings to verbose:
1) Goto Central Admin -> Operations -> Diagnostic Logging
2) In Event Throttling, Select a Category to "All" and Trace Log to "verbose".
3) Click OK.
Be sure to set back to High or above after troubleshooting the problem.