We created JMX beans (the ones that come with log4j are not very friendly) that can display / scan / crop / copy log files. As WolfmanDragon noted, you can use custom applications to send log messages to other destinations. In combination with a filter, you can send log4j error messages to the management application using JMX notifications, etc.
If you have a huge amount of magazines on many machines, you can use something like Splunk .
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