Plastic launches and Steven Johnson writes eloquently about it. I’ve signed up, and though I’ve never really warmed the slash structure (I get it, it’s never done much for me is all) I think it might be interesting in this context. I particularly like that Plastic is going to aggregate the contributions of partner sites. It’s like there was an original idea (basic linear content aggregated on a site) that was then turned inside out (resulting in the crossover of syndication feeds and weblogs, among other things). Then Plastic is turning it inside out again – but what comes out isn’t the original, it’s a new mutation. Mutation is good.