I'm not sure if this is know already, but I don't feel like looking through all those pages on the CM7 thread to find out. So blow is the tip.
I'm running CM7 right now and sometimes the notification bar gets stuck; as in things still show up in it, but you can't clear items or click on things in there. I found an app in the Play Store called Notification Restart that seems to make it right again. Not permanently, but how often does the bar get stuck anyway
I only tried it once but it worked that one time so as of this writing I can say it works 100% 
I'm running CM7 right now and sometimes the notification bar gets stuck; as in things still show up in it, but you can't clear items or click on things in there. I found an app in the Play Store called Notification Restart that seems to make it right again. Not permanently, but how often does the bar get stuck anyway
I only tried it once but it worked that one time so as of this writing I can say it works 100% 