I had a bit of trouble setting up Trash Locked Files because I couldn't input the registration key (that you have to email the developer for) on my Intel iMac. Support gave a number of helpful suggestions but it was only when I upgraded to 10.4.8 that it did input and then the application worked as it said. I had done eveything suggested on Apple's support site to get rid of some files in the trash (except single user start-up) but just got that message that I didn't have sufficient privileges....Trash Locked Files sorted that lot out with a click of the mouse.

Excellent - and it's free! So thanks very much.