To prepare for Lync exams 70-664 and 70-665 use the following materials. Bold links are strongly recommended to view! Don’t forget about Second Shot (until 31 May, 2013) which gives you free retake exam.
TechNet:
Unofficial Prep guide for TS: Microsoft Lync Server 2010, Configuring (70-664)
Unofficial Prep guide for PRO: 70-665 Part 1 of 2
Unofficial Prep guide for PRO: 70-665 Part 2 of 2
Official Lync downloads:
Microsoft Lync Server 2010 Protocol Workloads Poster
Microsoft Lync Server 2010 Administration Guide & Windows PowerShell Supplement
Microsoft Lync Server 2010 Mobility Guide
Microsoft Lync Server 2010 Planning Tool
Microsoft Lync Capacity Calculator
Books:
Mastering Microsoft Lync Server 2010
Great book! Helped me a lot to understand Lync architecture and how it works inside. Includes Lync Mobility Services , Exchange and third-party intergrations.
Microsoft Lync Server 2010 Unleashed
This book doesn’t include Lync Mobility Services. Other subjects (lync enterprise voice and orher) are good covered.
Videos:
UseIT | Roman Levchenko 
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