Found this youtube clip particularly useful with regards to how to making a show reel most effectivly with optimum results in our Professional Practise.
Have a look and let me know what you think, goes into depth about things that's may be considered as trivial but ultimately can make that extra difference to getting hired, for example, I am now considering factors affecting looking calm on an introduction, tips and ways in which to come across competent before I have physically even started dancing.
Here is the link to an example of a site that really, at second glance provides no useful information, I thought it was necessary to show examples of both.