We have previously gone on record as to why you should not be paying for a BlackBerry flashlight application. There is already a free FlashOn flashlight application from ShaoSoft but DavidB let me know that CompactByte also has a free flashlight app called Sam Fai.
The app simply has three options:
Increase your LCD screen brightness to the max
Turn on the BlackBerry LED notification light to a bright white
Turn on the camera flash for devices that have a camera flash
Blackberry 9300, 9330/Blackberry 89XX Curve Series (480*360): 8900(Javelin), 8910(Atlas), 8950/Blackberry 95XX Storm Series (360*480): 9500, 9510, 9520, 9530, 9550(Storm2), 9800/Blackberry 96XX Tour (Niagara) Series (480*360): 9600, 9630 Niagara, 9650, 9700, 9780/Blackberry Pearl 3G Series (360*400) Devices Models: 9100, 9105, 9670(Style)