Search engines are continually evolving their algorithms to stop the manipulative techniques SEOs use on websites to increase search visibility.

FORBES: Ethics in SEO: Your Website's Best Defense Against Google Algorithm Updates

While online flight search is rapidly evolving, we think there is room for more competition and greater innovation.

FORBES: Google Buys Huge Flight Search Engine ITA For $700 Million

In October, Excite, which is evolving from the second-largest Internet search site to a fully fledged online service, bought NetBot in order to acquire the firm's shopping-agent technology, with which it hopes to create a virtual megastore.

ECONOMIST: Internet shopping: The once and future mall | The

Search engine optimization (SEO) is evolving.

FORBES: The Successor to Traditional SEO