great topic
The music industry has always banked on big singles selling albums, but with MP3s, portable media, and stuff like iTunes the single has become even more important than the album. You can have a gold selling single without selling 200,000 albums, thanks to iTunes, Zune market place etc. Hence many pop, rock, and hip hop albums are essentially just vehicles to introduce a couple songs. Record labels get a big fat check without having to worry about manufacturing costs.
Personally I grew up with albums. My parents would play What's Going On, Thriller, Synchronicity, Superfly, etc on their old record player. You can listen to all those albums front to back for the most part, and I did as a kid. When I get a new album today, I listen to it front to back regardless of whether it's good. If a song sucks, I listen to it; I like the experience of an album.