The person featured in the above article has a blog, charmingly called Rowdy Kittens, and she has lots of great tips and links to get you on the path to simplicity.
One of the things from the article that I really liked was the emphasis on experiences over possessions. Taking a vacation with your family, say, instead of buying a fancy new car/large-screen TV/etc. We (as a society) are so deeply entrenched in consumer culture that we don't even notice it anymore. I really only started noticing my own tendencies when I didn't have the cash to do it anymore. I didn't think I was that much of a shopper, and compared to most people I know (coworkers, family, neighbors) I wasn't, but I did shop more than I needed to, and bought things I didn't really need, and haven't really used.
Yes, I am sick and tired of my wardrobe, but it's rather more than an awful lot of people have, and there's nothing really wrong with it. Sure, I could use some new shoes that aren't beat up/stained/worn, but the ones I have are serviceable. And so on.
I've been doing some inner work that nicely ties in with this, I think. I've been working on forgiveness. Forgiving everyone, and I mean everyone, both past and present, for anything they've done that has hurt me in any way. That's harder than I thought it would be, especially when someone continues to hurt me after I've forgiven them. Forgiving myself is just as difficult. But I have to, in order to move on. The rut I'm in is as much my own making as not. Probably more.
So, every day I will be doing something, anything, to reduce the clutter in my life. Start small, keep at it: that's my new motto.