There are a couple of new "experimental" apps in Nokia Beta Labs:
Diagnostics (for S60 3rd & 5th)
http://betalabs.nokia.com/apps/nokia-diagnostics
It only hands connections, battery and speakers (no help in WSOD!) but it's a start.
Nokia Custom Dictionary
http://betalabs.nokia.com/apps/nokia-custom-dictionary
Allows modifications to the dictionary used for predictive text input.