N73 as a torch
You need to pay for NTorch while SpotOn is a freeware alternative.
I tried NTorch and is useful. It uses the camera flash. So you can’t use the camera and the NTorch application at the same time.
Didn’t tried SpotOn. But it uses the screen display. So it may not be good as NTorch. But still, as being freeware we can try it.
For more details on NTorch visit http://www.otstudio.com/ntorchlite/features.htm
For Spot On visit http://symbianv3.com/system-tools/spoton-v002
Edit: The above link does not work for SpotOn as they have released a new version. Please see the post “Five Most Useful Free Applications“. The new version has more features and you can download if freely.