The good news about Media Center is that it is easy to get up and running. You'll need a relatively fast computer, and you'll probably want to choose your case carefully as it will be in your lounge room within cable reach of your TV. Most electronics and computer retailers like Domain allow you to test media centre for yourself "in-store", and there are a growing number of online stores offering tailored hardware solutions.
The final point is that this convergence is great for consumers. You can take control of your viewing experience to fit your lifestyle, skipping ads and watching shows that traditionally competed for your time at your leisure. You can view content from non-traditional and interactive sources. Most of all, the power over TV is moving away from networks and towards consumers and content originators - meaning you can tell Eddie where to go.