Practical Tutorials:

This link is to a video tutorial that allows you as a teacher to set up a list of students accounts using gmail for your classroom very quickly, easily and safely.

Online tutorial for beginners to the Internet. Sections include, How to hook Up, the Basics of a Web Browser, Filling out forms online, Finding stuff online, Using email, Online safety, Online communities

Atomic Learning provides web-based software training and curriculum resources for applications that students and educators use every day. The site provides thousands of short, easy-to-understand tutorial movies and a library of curriculum resources that can be used as an integral part of a professional development program, a valuable curriculum supplement, and an anytime/anywhere software training resource. (from the site) Note: although this site is not free, there are times when certain tutorials are free for a short period of time.
Bettscomputers has some great links to Flash tutorials and also provides some tutorials at the site that are simple and easy to follow.

Scratch is a programming language that makes it easy to create your own interactive stories, animations, games, music, and art -- and share your creations on the web. Scratch is designed to help young people (ages 8 and up) develop 21st century learning skills. As they create Scratch projects, young people learn important mathematical and computational ideas, while also gaining a deeper understanding of the process of design. (from the site) Darrel Branson has done a lot of work and has listed some great resources on his blog with Scratch and would be a great contact if you are interested in designing some lessons around Scratch.
Common Craft is an site that creates simple video tutorials that explain many of the things that are available on the web. These tutorials would be very useful to teachers to help them explain web 2.0 applications to students. They would also be a perfect start for professional development programs on the use of Web 2.0 in the classroom.
Here is an example of how they explain how wikis work.

Flash animation: these are some tutorials for teachers who are teaching animation using Flash.