Screenbird is an online method of recording step-by-step tutorials and sharing them with colleagues, classmates, anyone. What I particularly like about it is there's no log-in required. Students can record their how-to, save it to a class wiki and create a collection of how-tos that everyone-even teachers-can use.
You can create a 30 minute video (Animoto's is 30 seconds)
Screenbird will host 150 minutes on their server, but you can create a lot more if you host it on your own wiki or YouTube.
You can capture the entire screen or just the part you want.
It's intuitive, allowing it to be more student-centered than other online tools.
There are great tutorials on the website. The class can watch the videos, test it out, and get help where needed.
One the home page of the Google Chrome Web Store this morning I saw the Daum Equation Editor. The Daum Equation Editor is a free, online tool for quickly writing equations that you can save as text or images to use in documents. You can use the equation editor by typing on your keyboard and or selecting symbols from the Daum Equation Editor's menu.
"The capstone of the curriculum framework is an online Beyond Textbooks™ wiki-a web based tool that allows for the collection of digital curriculum materials, support materials, and other digital resources accessible to all faculty. Teachers use the wiki to review the curriculum and calendars, locate and/or share resource materials, and to communicate and collaborate with peers across the District and State who use the same curriculum but who would not otherwise be available to share resources and provide other support."