In our new Flashback series we'll be taking a look back at some of the devices and events that shaped the mobile phone industry and brought us where we are today. The Nokia 5800 XpressMusic was a good phone for its time and with 8 million units sold in the first year of availability, it proved to be a commercial success by the Finnish giant, which was on top of the world. But if we remove our rose-colored glasses, we can see that this phone marked the beginning of the end of Nokia's dominance. When it came out in late 2008, the 5800 had just about everything you can want from a...