The Connections development team have put together a great series of videos over at YouTube that take you through a deep dive on some of the administrative aspects of Connections.
The intended audience for these videos are IT administrators who run or are about to run IBM Connections in their infrastructure or ISV's / Business Partners interested in developing applications on top of Connections.
The latest video, which was posted on Wednesday, is a deep dive on the Profiles API:
Another video that I recommend is this one from Judy Piper. Everything I learned about coding for Connections, I learned from Judy Piper, specially thanks to her tutorials and sample code. If it wasn't for Judy's tutorials, I don't think I would've been able to create the some of the plugins that I have coded and have made available in the Lotus App Catalog.
One that a lot of people may like (based on the number of questions that I've received about this) is how to load photos into Profiles from LDAP using TDI (Tivoli Directory Integrator):