Loggin' with log4net
The log4net-logging solution is definitely worth a view:
http://logging.apache.org/log4net/
Never ever had a more satisfying logging solution before. And best of all: It's the same as if you would be using log4j, the famous logging solution for Java.
A good starting-point is here:
http://www.ondotnet.com/pub/a/dotnet/2003/06/16/log4net.html
Try it. Love it!