What To Buy
So, by now you may be thinking that this form of networking could solve a lot of your home networking problems. So the next question is obvious - where do I start?
Thankfully, as already explained, this form of networking is fairly simple. To get a start, all you'll need to do is buy two adapters, which will be plugged into wall sockets in different rooms. If you simply need a bridge - that is, a connection between only two rooms - and speed is not absolutely crucial, then I would take a serious look at the Netgear XE102. The advantage of this adapter is its small size and unobtrusive design, allowing it be fitted to the socket without causing a major obstruction. The price is competitive, as well.
Going up the food chain, you'll find Belkin's 200Mbps Adapters. As I said earlier, these will not actually reach the claimed 200Mbps rating - at least, not most of the time. However, these are still some of the faster products available. Better yet, Belkin's adapters seem to understand that they are expensive, and therefore shouldn't look tacky when placed in a decently furnished room.
Remember, though, that you don't have to use adapters from the same company. They all use the same standard, and so any two adapters should work with each other. So, if you want to use the cheaper Netgear adapters now, and then upgrade to the Belkin adapters later, you may still be able to find use for your old hardware.
In fact, flexibility is the greatest asset of power line networking. Use your imagination. There is no reason why this form of networking can't be combined with both wired and wireless solutions, so make sure you explore all options in order to find the solution that best fits your needs.