Consider using different text styles to break up text and make it easier to read. For example if you are using courseGenie then you can do this with box text and Panel text, as we have done on this page.
People will have different preferred learning styles. Some will still want to print things off. It is good to make sure certain pages (for example summary pages) are text only and printable. Alternatively you can provide a separate text only version.
However be careful not to overdo the use of different colours and styles. CourseGenie helps with this because it only offers a limited range of styles, but if you use software such as Dreamweaver you may be tempted to use too much colour, with a result that is messy and difficult to read.