These are very good introductory online course if you are a .NET developer and interested to learn more about SharePoint. 

A total of 12 modules are available:

Module 1: Developing Solutions on SharePoint Platform

Module 2: Web Parts

Module 3: Page Navigation

Module 4: Page Branding

Module 5: Data Lists

Module 6: Web Services

Module 7: Event Handlers

Module 8: Content Types and Site Columns

Module 9: Workflow

Module 10: User Management

Module 11: Silverlight

Module 12: Deployment