Even though I found most of the album to be boring at first, I liked the song "Bored" instantly. It has a simple but killer riff, cryptic lyrics, and cool whisper-to-shout courtesy of Chino Moreno, which is pretty much his trademark. All in all, this is the definitive Deftones song in my opinion.
"Root" has a shockingly catchy riff on what is one of the least immediate albums that I've heard, making it possibly the most melodic song on the album, and thus one of the best.
"7 Words" is the most popular song off of the album. It was the first Deftones single, and it often ends their concerts. The verses are practically spoken word, and the chorus is yelled. There's also an absolutely sick breakdown riff (one of Stephen Carpenter's best) over which Chino raps furiously.
"Engine No. 9" is another more popular song along "7 Words", "Bored", and "Root". This song is the most rap-oriented, and it also features an awesome breakdown. Overall, if you're an alternative metal fan, and you haven't heard this album, you really should. It may take a few listens to really sink in, but you won't regret it once it does.