Much like Tommy, I love and loved Radiohead. I was 12 when the album came out, and I remember seeing the video for 'Paranoid Android' on MTV and talking to a dude at school about this weird video I saw. I eventually bought the album and it changed my life forever.
Everyone has that one album or band that completely alters you, opens you up to new experiences, makes you seek out different things than you're used to, and forces you to question a lot of things about your life. OK Computer did this for me. I was never a big fan of music before Radiohead. I liked songs on the radio sometimes, I owned 5 or 6 CDs, and I actually cared what videos won on TRL back when Carson Daly was just starting out. After Radiohead, it was as if my entire world changed. The way I thought about life in general was never the same; the music gets all the recognition it deserves, but if you're someone who's only listened to popular music, the lyrics on the album will shock you. They aren't love songs or overly sad songs, but yet they managed to tap into so much emotional ground all the same.
I say that I loved Radiohead because they haven't been a big part of my life for a few years now. By the time of their 2003 tour, they had gotten me into so much other music because I ravenously read their press and books about them and sought out the albums they mentioned or people compared them to. It was the first concert I had ever been to, and I remember the sheer impact of realizing my favorite band was in the same place as me, playing the songs I went to sleep listening to every night, literally floored me. My legs felt weak and I thought I was going to pass out. But after the show, I sort of felt like this was as far as I could go. It doesn't help that they haven't released anything in almost 5 years, but during those years I discovered so many other bands that I don't have time to listen to them. I also tried to listen to OK Computer when on mushrooms and it put me in a really dark, scared frame of mind to the point where I had to turn it off and I haven't listened to it since.
I could talk all night about the album, but even if you don't like it, you have to admit it's one of those generational touchstones that everyone is familiar with. And that's enough to make it one of the best albums of all time in my book.