This site produces the best POI software for TomTom for PDA. It works with TomTom 3, 5 and 6. It not only provides Speed Camera updates but many more, banks, Ikea, PC World, Tesco, etc, etc, etc. I've used it for the past 3 years and its bril.
h**p://checkpoint.oabsoftware.nl/
h**p://checkpoint.oabsoftware.nl/