Proving that large corporations everywhere are equally uncoordinated, it seems that Wiley put out an electronic edition of OpenSolaris Bible
but didn't manage to communicate it to us authors so we could help promote it! Last we knew it was in the works, but we hadn't heard anything further. But then we got our royalty statement a couple of days ago and, interestingly, there were electronic units sold, which sent me back over to the book's page on wiley.com and there was the link to the e-book! I guess a positive spin to put on it is that it's another option for the Christmas list for the OpenSolaris enthusiast.
Unfortunately the set of supported platforms for the supported reader, Adobe Digital Editions, is not too friendly for those of us on open-source platforms. My best suggestion, though I haven't tried it yet, is to put it on a copy of Windows in VirtualBox.