This command-line tool can be used to create user-based notifications from the Notification Center in 10.7 (or greater)
Clone repository and install /usr/local/bin/usernotification
git clone https://github.com/jeremymatthews/usernotification.git
cd usernotification
sudo xcrun xcodebuild clean install DSTROOT=/
Usage: usernotification [-identifier <identifier>] [-title <title>] [-subtitle <subtitle>] [-informativeText <text>]
Options:
-identifier NAME some existing app identifier(default: com.apple.finder)
-title TEXT title text
-subtitle TEXT subtitle text
-informativeText TEXT informative text
Coming soon.