You can use different levels by calling other methods of Log. There's probably warn, error, fatal, debug, and maybe others (I don't have the docs in front of me, so I could have the names wrong). Consult the javadocs on which levels are available.
As to different appenders, I don't think Commons Logging supports this by itself. It is just a thin wrapper around various logging APIs. Have a look at Jakarta log4j -the standard logging API-, which works with Commons Logging and does support any number of appenders.
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