I've got tomtom in my car, which i'll usually use if I dont know the area, got all the latest speedcamera's on that. You can also get it to show certain attractions you wish to show (pubs/ petrol stations/ car parks etc). Its a great toy (well worth the 150 i payed for it!)
James i really think thats well worth paying. We could even go halfs and share the updates, or get ten people in a group buy and only pay £2 each!! lol
The free database on that site does have mobile locations and tom tom does alert you to these. Very useful to have. The only thing having the out of date database is it says there's gatso's where they arent (roadworks etc) and it doesnt have them where they are!! You cant rely on the information within it so keep your eyes peeled on the roads for ones it misses out.
i use roadpilot. It is gps based and you update it via internet and if u find a new camera which i have u get £20 off ur subscription. Its every year and costs £60 but worth it. The micro version ive got comes with a laserpilot now which detects laser guns etc. Well worth the investment.