Howard Shore is one of my favorite composers and I continually listen to the Lord of the Rings trilogy soundtracks. A movie has many components that make it successful, but in my opinion it is truly a masterpiece when it has a carefully crafted soundtrack.
I love how they bring back recurring themes from the first three Lord of the Rings movies. Yet, even though some parts are completely recognizable, these themes are filled with subtle differences. "Misty Mountains" in particular is a powerful track that is filled with wonder and adventure. "The Adventure Begins" builds excitement and has playful elements.
Overall, I really enjoyed the soundtrack and will continue to follow Howard Shore's music. The only downside to the soundtrack is that it is expensive. You can find it for download about half of what it goes for on CD. eMusic is a great place to look for downloads if you don't want it on a disc.