Web technology has come of age. These days, there's nothing a web site can't do: calculations, presentations, animations, interactions.

Unless you're Google, you'll want to use this technology sparingly. It can be costly to develop, and, worse, it can distract from your message.

Used wisely, however, it can add depth to your web site. If you're a mortgage consultant, a simple mortgage calculator could be genuinely useful to potential clients. If you're an interior designer, a well designed, interactive gallery of your work might truly impress.