Kaywa have released a public alpha version of the media manager their CEO Roger has been talking about for.. for years, I think.

It's supposed to be something very much like del.icio.us - not for web resources, but for things. They start with books (using Javascript for ISBN lookup from Amazon), but other media types should follow soon.
It runs on Rails, which is pretty cool - and quite a strategic break with their other products all being made with PHP. New developers new toys, I guess.

With my semantics hat on, I don't quite like it yet: RSS/XML everywhere is nice, but RSS/RDF, using e.g urn:isbn, would have been useful, too. You know, an Amazon->RDF bridge with a folksonomy on top.. yummy.



Edit: Despite the obvious connections, this little piece of software is not actually a Kaywa project. I'm told it's a private venture by Patrice ("a Jesus Freak and freelance software developer").