A recent lengthy discussion in the Interaction Design Association focused on the placement of actions in Web forms that span several Web pages. The quintessential question underlying this debate is: can an action which leads people to the previous step of a process be placed to the right of an action that leads users to the next step of a process?
yet another great article.
The following principles are fundamental to the design and implementation of effective interfaces, whether for traditional GUI environments or the web. Of late, many web applications have reflected a lack of understanding of many of these principles of interaction design, to their great detriment. Because an application or service appears on the web, the principles do not change. If anything, applying these principles become even more important.