Log4net/Logging - What have you found to be useful?

Question

I just started using Log4Net and was looking to see what you have found to be useful in your logging experiences.

What types of things have you found to be useful to log

Answer 1

Log4Net with Apache Chainsaw. Chainsaw is a dashboard for viewing your log messages from realtime. It can handle multiple apps, perform on-the-fly filtering, and a few other handy features.

If in doubt, log it (preferrably at a higher level like DEBUG or INFO or create your own level). You can configure what gets output in the config file.