The name alone should tell you that this isn't your average Napster clone. OpenCola was a clarion call to the peer to peer community, an attempt to redefine how data moves on the internet--an attempt, ultimately, to redefine what ownership means on this newest medium. One of the advertising gimmicks used in the early days of the project was an open-source cola--the can was to have the recipe printed on the side--hence the name of the company.
OpenCola Folders itself is a kind of research bot that noses around the internet for you, comparing notes with other people's Folders and finding stuff that you may want, but don't know you want. It's much more than a search engine, it's a relevance engine, which looks for things that are similar to stuff you've liked in the past, but not necessarily identical. Folders solves the problem that you can't know you want something if you don't know it exists. And it works extremely well; I've been using the beta for months now.
So if, like me, you've concluded that the internet hasn't really seen any new innovations in ten years--the last really big thing being the web browser--then check out OpenCola Folders. Whether or not the Folders project ultimately takes off (the company has decided upon a subscription-based model that I disagree with) the idea is really good, and deserves to be the next New Thing.