This is probably the dominant use of personal computers at present. Certainly the revolution in publishing that started with persona computers and laster printers and page layout software has had a big impact on text production. Research on the use of word processors for writing doesn't show a great change in the end products, although there are some relatively small changes in the writing process. It's not clear that this sort of text is going to displace traditional text anytime soon. This, to me, is the most interesting change in literacy brought on by current technology.
Many examples are available on CD ROM and on the web.