It is boring that you have an app that is spamming you with notifications in the bar. Google has listened to numerous complaints. With Android 4.1 Jelly Bean, it's easy to figure out exactly which app caused the notification and then remove the offensive app.
How to Disable spam app Notifications on Nexus 7
* When the spam notification pops up, long-pressing it using your finger.
* An "App Info" option will show up. Tap on it to directly to the App Info screen for that application.
* Then you can actually disable or uninstall it. Very useful tips and works for me.