http://www.wwnorton.com/chemistry/tutorials/ch1.htm - click on "1.4 dimensional analysis". it is an interactive program that explains dimensional analysis using animation rather than video in what i thought were very simple terms. also includes several problems you can try your hand at which are not chemistry related but utilize the concepts of dimensional analysis.
http://www.alysion.org/dimensional/analysis.htm#guide - medication math for the nursing student. great site with a variety of facts you need in a nice nutshell to do calculations including conversion factors, common abbreviations, a discussion about dimensional analysis, and practice problems with answers
http://www-isu.indstate.edu/mary/tutorial.htm - from the indiana state university a "basics" page on medication math with explanations on how to do a number of different types of medications problems (including iv problems), conversions and dimensional analysis with links to lots of practice quizzes.
Thanks Daytonite for the helpful links. I'm in my second year and they've just introduced dimensional analysis. One more semester after this and they decide to throw us this "curveball!" I've done just fine with my trusted and true ratio and proportion but your links at least give an explanation and comparison. Thanks again!