SMS Anticredit
I got tired of the SMS spam that periodically comes to me — offers for loans, mortgages, and so on. While watching one of the WWDC videos, I noticed that Apple had provided an API for filtering SMS messages. If your filter triggers, such messages arrive silently, without a sound or vibration, and go into a separate spam category in Messages.
Without much hesitation, I made this filter and uploaded it to the App Store. Hopefully it will be useful to someone besides me.
