Regarding the monitor being "widescreen", most if not all of the new monitors sold now are widescreen. You can divide the horizontal res by the vertical res. If it's 1.6 (16:10) or 1.78 (16:9), it's wide.
As for the movie scaling and black bars, that's up to your player software. You'll come across many different situations, depending on the movie in question. Most movies are actually 2.35:1, which means that even in a widescreen TV/monitor you'll have black bars. Such is the way of life.
There is a fixed amount of intelligence on the planet, and the population keeps growing :(