This is indeed a good post, thanks for the link.
Grellas is right to point out that current laws turn a range of intellectual goods into property. We shouldn't forget however how they do this: by enforcing scarcity when the default was abundance. By the way, you can get abundance back by breaking the law.
I reject the terms "property" and "theft" when talking about ideas and recordings because they are abundant by default. By using those words, they make you think in terms of scarcity. They skew your perception of the issues, then exploit that bias. This is why I insist that others do not use the word, "it's GNU/Linux" style. Even if you know what you meant, many people don't, and it has consequences. (In the same vein, I remind people not to say "internet" when talking about the world wide web alone. If you believe you "have the internet" as long as you can run a web browser, you won't notice nor protest when your ISP starts blocking TCP ports.)
I also reject copyright and patents altogether. Not because they are not property by default, and therefore illegitimate (I find this argument very weak). I reject them because I believe they do more evil than good. Most probably, they are more a hindrance than a help for our economy and our technological development. Not to mention the inevitable loss of individual liberties, which humans tend to value by themselves.
Overall, I believe scarcity should be abolished whenever possible. If we get to the point where there is so much abundance that life is not fun any more, then we'd have a good reason for scarcity. (Video games provide an example: god mode, unlimited ammo, and free experience points tend to spoil the game. I'm still tempted by the cheat codes, but I think twice before I type them.) But right now scarcity is a problem to be solved. Copyright and patents are part of that problem (or at least a symptom).