A quick note – it appears the Lync Resource Kit Book is now complete. I am looking forward to it given how well written and useful the original Office Communications Server Resource Kit Book was.
Apparently a decision has been made not to release a hardcopy version of it, but rather an eBook version. In the meantime, you can download 19 Free Chapters here: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=22644.
Tip: you can download all 19 Chapters at once by downloading “Microsoft_Lync_Server_2010_Resource_Kit_Chapters.zip” (half way down on the download list).
Read more about it on NextHop: http://blogs.technet.com/b/nexthop/