Further experimentation with +NotifyMyAndroid
This time it's a Windows service that monitors certain folders and sends a notification when new files are added. I wrote something similar a while ago that posts to Twitter so just the replacement of the notification was required.
It's a bit scrappy and may not handle all errors particularly well but the source is there for you to fork/use as you wish. There's a release zip file in the Downloads section containing all you need to get it running, just modify the config and settings files as required and refer to the wiki page for pointers on how to install a service.
No support offered on this, use at your own risk etc..