Go..Go..Goa

Service Applications:

Configuring search service application:

http://www.boostsolutions.com/blog/how-to-configure-the-search-service-in-sharepoint-2010/

Configuring Service Account:

http://www.boostsolutions.com/blog/how-to-configure-service-account-in-sharepoint-2013/

Configuring Managed metadata:

http://sharepointgeorge.com/2010/configuring-managed-metadata-service-application-sharepoint-2010-part1/

Configuring user profile service application:

http://nikpatel.net/2013/02/18/step-by-step-configuring-least-privileged-user-profile-service-application-and-user-profile-sync-service-in-sharepoint-2010-developer-vm/

Migration:

database attachment method-
http://www.winwire.com/moss-2007-to-sharepoint-2013-migration-using-database-attach-method/

direct method using third party -http://sharepoint-community.net/forum/topics/migration-of-moss-2007-to-sharepoint-2013

http://www.sharepointreviews.com/sharepoint-migration/169-content-matrix-migration-manager-for-sharepoint-by-metalogix

will search for Videos soon... :)

Yammer:

http://en.share-gate.com/blog/between-two-farms-episode-1-introduction-yammer

http://www.sharepointpals.com/post/How-to-Communicate-with-Yammer-from-SharePoint-2013