Sharepoint is extremely popular and it's clear that developers with Sharepoint skills are in high demand. I know this is absolutely the case in Belgium.
I personally prefer classroom trainings but if you like to get started, prepare for a classroom training or other, then this online training option on MSDN Ramp Up is a great place to start:
As a developer, would you like to learn more about Microsoft Office SharePoint Server (MOSS)? MOSS is based on Microsoft Windows SharePoint Services, which gives developers the opportunity to get more problems solved with less effort. Windows SharePoint Services 3.0 takes full advantage of Microsoft ASP.NET and the Microsoft .NET runtime. The new features and added programmability support in MOSS provide a wealth of development opportunities. This course will immerse you in many of the developer-centric capabilities of Microsoft Office SharePoint Server.
Level 1: Web Parts Did you know that in SharePoint you can build pages as easy as in ASP.NET – and allow end users to create dashboards? Web parts allow for creating components of Web user interface that can be reused on multiple Web pages. These are introduced in ASP.NET and built on in SharePoint where they can be added to pages by end users and managed by IT Professionals. In this topic you will learn about building simple Web parts for SharePoint and how to connect them back to SharePoint site data.Level 2: Data Lists Did you know that SharePoint developers can work with data from lists that users get access to too? Data lists provide data storage for end users in SharePoint. End users can create lists with schema all through the SharePoint user interface and they can create, edit, and view the data. All of this data can be programmatically accessed by developers and this topic is all about that.
Level 3: Event Handlers Did you know that SharePoint developers can automatically process data that your users upload via a spreadsheet? Event handlers (or event receivers) are custom code that runs on the SharePoint server in response to something that happens on the server. Event handlers can be useful for running business logic in response to data being added to the site. This topic shows how to create simple event handlers and investigates ways that event handlers can be used in SharePoint.
Level 4: Workflow Did you know that you can write WF workflows in SharePoint without having to worry about storage, persistence, or how to interact with the user? Workflow in SharePoint allows for implementation of processes that require interaction such as email approvals or form completion by people in your organization. This topic shows you how to create simple workflows in SharePoint using Visual Studio that involve approvals from people by email and for meeting room resource bookings with an administrator.
Level 5: Silverlight Web Parts Did you know that you can build rich Internet applications with SharePoint? Silverlight is a new Web user interface technology from Microsoft that allows for each implementation of animations and videos. This topic shows how a SharePoint user interface can be enhanced by using Silverlight in Web parts as part of a SharePoint site.