I realized V0.10 of Exutil - a small utility to batch rename pictures by date sorted names based on Exif date information or by file's date with an integrated thumbnail viewer.
This is _not_ a killer app, but my playground to get familiar with RapaGUI (earlier versions used MUI Royale). V0.10 is the first RapaGUI based release and not finished, but rather a snapshot. Anyway I gave it a go.
http://via.i-networx.de/Exutil/about.htm
I am happy for any feedback.