Apple TV
This little black beauty is an oldie but a goodie. I purchased an Apple TV last fall when these new ones came out, and it though it's the cheapest addition to my home entertainment center, it is perhaps the most important. Well, other than the TV and stereo. But that's just it: you don't need much more than a TV and an Apple TV. The Apple TV will play music and movies and shows that are on your computer, it connects to Netflix and YouTube, and you can use it to rent movies on iTunes as well. It's small, sleek and inexpensive. Recommended for anyone and everyone with a TV and an Internet connection.