We’re pretty excited to push another update to our first Google Wave bot – the AmazonBot. The update includes a refreshed UI, Amazon Marketplaces support, and language localization.

It’s undeniable: Google Wave has captured the imagination of techies, social media enthusiasts, and web users everywhere. Its combination of email, real-time chat, wiki tools, and social networking have generated an incredible amount of buzz.

While the focus of this buzz is centered around Google Wave’s features, there’s an aspect of the new platform that hasn’t received the attention it deserves: Google Wave extensions, which allow any developer to add their own gadgets or robots to the open-source tool. Extensions offer the potential for Google Wave to end up being used in so many different ways. But what exactly is an extension? Why would someone build one? And how exactly does one go about it?