some log4net articles, looks great

http://www.beefycode.com/post/Log4Net-Tutorial-pt-1-Getting-Started.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-2-Basic-XML-Configuration.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-3-Appenders.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-4-Layouts-and-Patterns.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-5-Using-Logger-Objects.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-6-Log-Event-Context.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-7-Filters.aspx

http://www.beefycode.com/post/Log4Net-Tutorial-pt-8-Lossy-Logging.aspx

http://www.beefycode.com/post/Log4Net-Recommended-Practices-pt-1-Your-Code.aspx

http://www.beefycode.com/post/Log4Net-Recommended-Practices-pt-2-Isolating-Bugs.aspx

http://www.beefycode.com/post/Log4Net-Tutorials-and-Resources.aspx

http://www.beefycode.com/post/Death-By-Logging-1-Logs-Consume-Space.aspx

http://www.beefycode.com/post/Log4Net-Hack-Customizing-Log-File-Paths-After-Configuration.aspx