An interesting article by Ted Nelson - the inventor of hypertext - about the limitations that software still imposes on us today, even though we could have come much further. For him, we haven't progressed much beyond paper and pencil, not even with the much-praised Web - ultimately the concept of pages and browsers is still heavily bound to old concepts.
A few of his criticism points are being addressed today by techniques developing in the realm of weblogs (trackback, comment functions at a level below the page, search functions on page elements instead of entire pages, higher degree of linking), but largely he is right - it's actually somewhat depressing when you consider how the digital simulation of paper and pencil is becoming ever more perfect, while at the same time possibilities are being squandered.