Apple iTunes 9
Since Apple iTunes 9 there is a watch folder build in! More documentation here :
iWatchSyncer is a small WPF c# program that will monitor a given location for file/folder addition.
When a mp3 file, or folder containing mp3 files, is added iWatchSyncer will automatically add these to the iTunes music library.
Instead of doing this yourself manually in iTunes!
Currently iWatchSyncer will only import native mp3 files!
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If anyone would like to help out or has any feature requests or bugs, just contact me ( click on my username below )!