Discovery Streaming  (http://www.discoveryeducation.com/)

+ SWSD students have log in already (link:  http://students.discoveryeducation.com/)
+ lots of great tutorials, resources as well!
+ built in gradebook
 = create classes
 = can be time consuming to set up

Moodle (http://swmoodle.swsd.k12.pa.us/)

+ SWSD students have log in already
+ Many tools available - not just assessment
+ built in gradebook
- features getting dated


iQuiz Maker (http://www.iquizmaker.com/)
+ For iPods

More Online Tools: 

http://web20guru.wikispaces.com/Web+2.0+Resources#Assessment%20and%20Evaluation

http://www.techlearning.com/article/Blogs/34574