SuperSoft has been designing multimedia training materials for clients as well as the general public for 6 years now. We have recently been contracted by several publishers (including Coriolis and IDG/Dummies) to accent their publications with multimedia cdroms. Some of the titles we've worked on are shown below.

The sites we sell our books through include:
http://www.aplusexam.com
http://www.aplus-certification.com
http://www.apluscertification.com
http://www.mcseprep.com
http://www.microsoftmcsetraining.com