Hi
This is from lifehacker:
Use Belvedere's friendly interface to create advanced rules to move, copy, delete, rename, or open files based on their name, extension, size, creation date, and more.
You could create a rule that monitors a folder and then runs a custom command once that rule is met. the custom command would be to launch
growlnotify.com to send the messages you need with the information you want. for example:
"C:\Program Files\Growl for Windows\growlnotify.exe" /a:"Folder Monitor" /r:"New File" /n:"New File" /t:"Folder Update" "The folder you are monitoring has changed"
Belvedere has built in growl support on completion of actions but no action to just announce via growl when a file is added to a folder (that i can find). So you would use a custom action and use the command I have provided above and it should be fine. I have not tested this myself but from the other custom actions I use in 3rd party apps this should work fine.
HTH