There is one day left of the free Sharepoint training
All you have to do is register and the training is free
it looks to have some interesting topics, day 3 has some information about web services and workflows
Day 3 (Live Meeting 3 hours) 1:30 – 4:30
• Client Object Model: The Client OM can be accessed via web services, via a client (JavaScript) API, and via REST
• Accessing External Data: Business Connectivity Services (BCS) enables integration with back end systems
• Workflow: A powerful mechanism to create functionality using Windows Workflow Foundation
Hosk's Dynamic Blog 