I frequently find out about new and exciting training tools both from Infopeople and the Continuing Library Education Network & Exchange Round Table (CLENE) of the American Library Association. In June 2007, I read a wonderful blog entry, A Quick Intro to ScreenCasting  by Steve Garwood in CE Buzz , CLENE's blog. Steve describes how he used Camtasia software to record a PowerPoint presentation he did on ScreenCasting as he spoke.
Since I recruit instructors for Infopeople I contacted Steve and voilà, his Infopeople onground course became a reality, Tutorials 2.0: Teaching the Public and Training Staff with Online Screencasts ; sessions start this month.
Even if you aren't ready to take a course, do check out the course description and sample shown in his blog entry to see a really cool tool your library could use to do tutorials for the public or for staff training.