I love having the ability to set different profiles on my mobile phone based around what I'm doing at the time, as there's nothing worse than you're phone ringing loudly when you're in a library or being too quite when you're working at a busy construction site. Not that I work on a construction site, but you know what I mean.
Profile Shortcuts is an interesting app that allows you to map different profiles to different keys on your phone, making for much faster switching between them. If your phone supports it, you can even apply voice commands to change profiles. For instance, you could say 'silence' to put the phone on silent, just like a strict teacher. Wow, the power!!
Ultimately, Profile Shortcuts is a great solution to make it easier for you to chage the active profile on your mobile phone.