Any apps that will allow me to set a profile that only allows emergency calls through? I work third shift so I sleep during the day but I get calls all day long so I shut my ringer off.  I would like to be able to set a couple phone numbers that can ring through no matter what.  Using Google Voice to do this won't work because I get calls directly to my cell # as well as to Google Voice.
The Setting Profiles app can do that. From their site:


  What if I don’t want to miss an important call while I’m on mute?
  
  You can overwrite current sound
  settings with a rule based on Incoming
  Call condition. Here is how to:
  
  
  Create a new rule 
  Add Incoming Call condition and set it to your preferred contacts group (like VIP or Family)
  Add Activate Profile action to activate the profile where sound is On and/or some custom ring tone specified
  
  
  That’s it! Now even if your phone is
  set to mute, it will still ring in
  case of a call from someone from
  Contact Group you have set up in step
  two.


They currently have two versions of the app - a Lite and Full. I would try the Lite version to see if it has this feature first.

QR Code for Setting Profiles Lite:



QR Code for Setting Profiles Full: