We recently conducted another tutorial at the XLDB 2013 conference, hopefully elucidating how to get the most out of the system, showing off some new SciDB features, as well as SciDB-R. The tutorial uses a deck of slides and a web-based AMI image. You can fire up the AMI, look at the slides and run some of the queries from the slides yourself.
The video is available here: youtube.com/watch?v=SsF_Mke0Mlw
The AMI image for this talk has been retired. However, you can check out some of the more recent and higher-quality AMIs at discover.paradigm4.com/Try-SciDB.html
Enjoy. Let us know if you have any feedback.