Flash & Flex Developer's Magazine has a new issue out on Project Management. On p. 20-29, there is an in-depth look at how to get started using Basecamp. It's a good, no-nonsense primer for anyone who wants to learn the basics of Basecamp.
The following information will not only review features, but also touch on how we should use them. This is to help not only manage projects, but also to be more aware and efficient in getting things done correctly.
Here's a sample page:
Download the entire issue (email required).