TrekinU is a great Flash based application for presenting your photographs, that lets you show where the pictures were taken on a Google Map and also lets you add your own soundtrack to the presentation.
When you press play the application presents a slide show of your uploaded photographs. With each new photograph the map recentres on the picture's location. You can zoom in and out of the map and you can also switch between map and satellite views.
This is truly a brilliant way to be able to present a trip or journey you have taken. TrekinU also allows users to add the flash application in their own websites by cutting and pasting a small piece of embed code.