I’ve had Nokia Series 60 phones for a while and currently have a Nokia N73 – one thing that has always bugged me is no automatic keyboard locking and recently I have used up all my minutes due to making phone calls when the phone is in my pocket !
Anyway did a bit of Googling and found Autolock , a neat little application that installs on your phone and does what Nokia could never be bothered to do – automatically lock your keypad after a set time.