This site is not indeed to have pages of links to other sites.  However, there are some articles that I do like to refer people to.  These will typically be answers to questions that students have asked.

SharePoint hybrid What you do and don’t get with an Office 365 SharePoint hybrid solution Chris O’Brien Blog
Exchange Preferred Architecture An Exchange Team Blog article explaining the standard configuration recommended for Exchange 2013 in most environments. The Exchange Team Blog
Check TLS Status Secure Email Test Tools and Services
Certificate request based on an existing Certificate Utility that allows you to use an existing certificate as the basis of a request but make modifications (e.g changing SANs) before submission. Jeff Schertz’s Blog 
Exchange 2013 Server Role Requirements Calculator The calculator supports the architectural changes made possible with Exchange 2013: The Exchange Team Blog
Exchange 2003 to 2010 Transition Guide Rapid transition guide from Exchange 2003 to Exchange 2010
Exchange 2010 and SIS Talk about lack of Single Instance Storage (SIS) in Exchange 2010 including database size implications Dude, Where’s My Single Instance?
Exchange 2010 Solution Reviewed Program (ESRP) – Storage v3.0 Results of 3rd party storage stress tests, useful for planning storage. Microsoft Technet Site
Exchange Pre-Deployment Analyzer Is your organisation ready for Exchange 2010? – here’s the tool to check. Microsoft Download Site
Forefront Threat Management Gateway 2010 Capacity Planning Tool Helps customers understand what hardware they need in order to support the number of users, WAN bandwidth, features and protections enabled in their Forefront TMG 2010 deployment. Microsoft Download Site
Hosting Deployment Guide for Exchange Server 2010 SP1 Beta This download contains topics that will help you plan, deploy, and manage Exchange Server 2010 SP1 in a multi-tenant organization Microsoft Download Center
Installing Exchange Server 2010 pre-requisites on Windows Server 2008 R2 Anderson Patricio MVP Blog
IT Showcase On: Microsoft Exchange Server 2010 Deployment Microsoft IT Uses Low-Cost Storage to Boost Mailbox Size and Significantly Reduce Costs Microsoft TechNet
Regular Expression Library Warning, although PowerShell supports a full range of regular expressions, Exchange only supports a subset so not all of these will work with Exchange
Retention Tags in SP1 Beta content Elan Shudnow’s Blog
Script to modify CAS URLs In Exchange 2010 you need to set the Internal URLs for various services on the Client Access Server
Sender Based Routing 4th Reply: Routing rules for COCO and Government Connect policies MSExchange forums
Single Item Recovery in Exchange Server 2010 Single Item Recovery prevents purging of data and provides versioning capability The Microsoft Exchange Team Blog
Top 10 Exchange Storage Myths Some resources to bust some of the most common myths and mis-perceptions about 2010 data storage. The Microsoft Exchange Team Blog
Understanding Client Access Server Namespaces Options for Namespace planning Microsoft TechNet Site
Understanding the Relative Costs of Client Access Server Workloads This white paper presents an estimate of the relative CPU weights of the different protocols on the Client Access server that can be used to produce a more detailed estimate of hardware needs when you design a new Exchange 2010 deployment or expand an existing one. Technet Whitepaper
White Papers: Exchange 2010 Tested Solutions Example of tested configurations with methodology Microsoft TechNet Site