My travel tip is the result of a real life experience.
Before taking a big trip, buy several memory cards for your digital camera. Every two days, take the current one out and put it in safe place, such as toiletries bag or zippered portion of luggage while inserting the next one in the camera.
This method almost guarantees that if your camera is stolen by airline personnel (as mine was), the most you will lose are the last two days of photos.
With memory so incredibly cheap these days, it's the cheapest insurance you can buy.
As for me, all of the pictures from a recent trip to London are now but a distant memory.