The much requested feature for Google Chrome is the support for extensions, in fact the lack of extensions is preventing users like me to fully migrate from Firefox to Google Chrome. According to Google OS blog this will change pretty soon, Google Chrome may offer support for extensions by May 2009.
Nicholas Moline noticed a session on Google Chrome extensions in Google I/O conference docs. Google I/O is a developer conference that presents highly technical content on Android, Chrome, App Engine, Google Web Toolkit, Ajax and more according to Google. A session in the conference is about developing extensions for Google Chrome.
Learn how Google Chrome makes it easy to write extensions using the web technologies you already know. This talk will cover the basics of the extension system (distribution/packaging, installation, updates), as well as the different APIs to enhance with the browser.
I guess now we can assume that the support for extensions in Google Chrome is just a matter of time, in fact before May 27th (conference start date) or after that date.