OSGi Spec Book Available!
Finally, after too much time I can announce that the OSGi specification is available in book form. Though the PDF one can download from the OSGi website is very convenient, nothing beats a real book to study a particular section, browse, and discover new sections.
The OSGi Alliance has authorized aQute to sell a version of the R4 specifications. OSGi members can receive a discount, please go to the OSGi Specifications Book page for instructions. Isn't that a wonderful reason to become a member?
Otherwise, you can buy the books in the web shop.