Screencast for MOSS 2007: A fantastic way to learn about MOSS 2007.

Here are some examples..

Building ASP.NET Web Parts for Windows SharePoint Services 3.0
Create an ASP.NET Web Part project from scratch and get it up and running within a Windows SharePoint Services 3.0 site.

Creating a Custom Page Layout with SharePoint Server 2007
Create a custom page layout using the Web Content Management features of SharePoint Server 2007.

Creating and Testing Features with Windows SharePoint Services 3.0
Use Visual Studio to create a custom feature and an associated assembly DLL.

Creating and Using Content Types in Windows SharePoint Services 3.0
Create user-defined content types using inheritance, and then configure a document library to use these content types.

Creating and Using Event Handlers in Windows SharePoint Services 3.0
Create a list item receiver class to handle both synchronous events as well as asynchronous events.

Creating and Using Site Columns in Windows SharePoint Services 3.0
Create and reuse site columns across the sites within a site collection.

Creating Custom Document Information Panels
Discover the integration that exists between Document Information Panels and content types in Windows SharePoint Services 3.0.

Creating Custom Task Panes in Visual Studio Tools for Office "v3" June CTP
Create an add-in for Excel 2007 and then customize the application-level custom task pane.

Creating Custom Workflows with the SharePoint Designer 2007
Build a custom workflow using the SharePoint Designer wizard.

Creating Windows SharePoint Services Sites with Support for Wikis and Blogs
Leverage the new built-in features for creating sites with blogs and wikis.

Customizing a Windows SharePoint Services 3.0 site with the SharePoint Designer 2007
Understand the difference between page templates and page instances, and then learn how to customize your pages.

Customizing the Ribbon with Visual Studio Tools for Office "v3" June CTP
Create an add-in for PowerPoint 2007 to customize and modify the ribbon.

Extending the Office 2007 UI with a Custom Ribbon
Create a shared add-in with Visual Studio 2005 that extends the new user interface with a custom ribbon.

Extending the Office 2007 UI with a Custom Task Pane
Create a shared add-in with Visual Studio 2005 that extends the new user interface with a custom task pane.

Generating Office Documents using the New Open XML File Formats
Generate, read, and modify documents without going through the object model of the hosting Office application.

Getting Up and Running with Excel Services
Configure Excel Services so that you can publish an Excel spreadsheet to a Windows SharePoint Services 3.0 site.