Attendance allows you to take and keep attendance records. Its main intended use is for teachers to keep track of records for their classes, but it can also be used for meetings and group gatherings. The attendance statuses are completely customizable.
These are the "Youth Portraits" included in EduTopia's Digital Generation Video Project. We are watching one of these each week in our "Technology 4 Teachers" class at UCO in Spring 2010, and students are reflecting on the videos in their blogs. Curriculum is on wiki.powerfulingredients.com