If your looking for the Lync 2010 Resource Kit its not out yet. But the good news is some of the chapters are available for download. Eventually all the chapters will be posted online. My former co-worker Dustin Hannifin worked on the SharePoint Integration chapter, Nice work Dustin! You can find the downloads here:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=8c64a1e1-f0b3-479c-a265-e480875c61d8
The following chapters are available today.
- Conferencing_and_Collaboration
- Enterprise_Voice
- New_Features_Overview
- Response_Group_Application
- SharePoint_Integration
- Technical_Overview