Microlog is featured on the front page of Suns Mobile & Embedded Community. Please take a look at it: http://community.java.net/mobileandembedded/
Microlog is a small logging library for Java ME (J2ME) like Log4j. It has support for logging to console, file, RecordStore, Canvas, Form, Bluetooth, a serial port (Bluetooth, IR, USB), Socket(incl SSL), UDP, Syslog, MMS, SMS, e-mail or to Amazon S3.
Microlog is licensed under The Apache Software License, Version 2.0 so it is possible to link and distribute commercial software with this library.