logcat-mode is a tool for viewing Android system log output. It supports filtering output by a configurable set of rules, pushing and popping rule sets, visiting Java files referenced in log messages, and viewing metadata about log entries.
You can configure the display style and individually enable and disable showing fields of log records. These changes apply to log records already in the buffer as well as log entries subsequently received.
Another convenient feature is calculating the time difference between log entries.
You will need fb-adb in order for logcat-mode to work.