“Change is always hard, and knowing when to upgrade or redesign is among the most critical events in a site’s history. A successful transition from old to new will re-vitalize a community, give renewed interest in your content or perhaps better portray your services. A poorly thought through redesign may cause your current user base to consider going to your competitors instead.”
This is a quote from an excellent post about web design that is both interesting and thought provoking. It’s well worth a read. I just love the way the author introduces the term Reboot as a synonym for a complete re-design.