This is a simple viewer package that utilises Darren Fergusons Log4Net for umbraco package: http://our.umbraco.org/projects/developer-tools/log4net-for-umbraco
It will install a Tab in the developer section where you can see log4net events. Events are colored according to their level so you easy can distinguise the different types.
Plese refere to Darrens package for info on how to log in your own code and a peek at the log4net config examples: http://logging.apache.org/log4net/release/config-examples.html could also be recomended
* If you find it usefull please give it a vote *