links for 2009-02-14

Nothing particularly new here, but a useful study to be able to point to. 19% of 18-24 year olds have used Twitter or similar, and users of such services use technology to communicate, gather and share information at a high rate, as opposed to passive consumption.

Calibre is an open source ebook library manager, synchronisation assistant and integrated reader. It does what I think an ebook manager should – basically acts as an iTunes for the written word – but doesn't quite have the visual polish of that kind of commercial app yet. I'm sure that as ebooks become more popular, projects like this will snowball correspondingly.

ePub is the format (or in fact, collection of formats) supported by the International Digital Publishing Forum. It looks like it'll turn into an open ebook standard (in fact, the IDPF used to be called the Open eBook Forum), and is supported by everything from web-based readers through dedicated devices and software like Stanza on the iPhone. O'Reilly seem to be behind it hard, but where are the commercial publishers at?