I've recently discovered Toucan and have to say that I love it! Works exactly as it says on the can, if it came in a can, which it doesn't.
Suggestion: add an option to be able to adjust the level of information displayed in the log. I primarily use Toucan for mirroring my PA suite to my HDD, in case of USB failure. It'd be nice to be able to change the logging level so that it would only show me copy/delete failures, instead of every copy, every delete, etc.
This feature could take place as an option on the Settings tab, or as radio buttons (e.g. "warnings", "errors", "all") on the log window itself.
Opinions of others would be appreciated.