Tom just let me know that Rgeorge has released a free flashlight application on BlackBerryForums. The application is dead simple. It just turns your screen white on 100% brightness and on newer devices it will make the status LED really bright. So far the author has tested it on the 8100 with OS 4.5 but says it should work with any OS 4.2+ BlackBerry. The download is desktop only for now and you must register on BBForums for the download.
You can find the application at this link. Let us know what you think if you install the app.
On a side note you can always just open up the video recorder on OS 4.3+ devices with cameras and that will turn on the LED flash which works as a flashlight.