You can use all wiki markup for making your slides - just keep the following in mind: for a DiaShow, a bigger font will be used, so don't put too much on a slide or you will have to scroll if you use colours, keep contrast in mind - especially if you want to make a printout. presentation will look different on the beamer and on paper as on your screen. if you use graphics, use thicker line width or they will be hardly visible.