In the design phase of the training (as really any phase) there are several things that need to be done -- first, grab attention with your opener, second, remember to engage your learner every 8 minutes with interaction, third, remember to chunk material together in smaller bytes.
There are alot more things you can do. I learned alot in just a 1 hour e-learning presentation by Bob Pike last month. I would strongly recommend taking one of the courses for Train the Trainer -- either the boot camp or the 101 session.
Thanks!