It appears that a recent build of Chromium has support for Greasemonkey -- a very popular, and previously Firefox-only, browser plugin. Greasemonkey can be used by developers to do a bunch of useful things like creating mashups, creating themes, and fixing annoying problems on websites without needing to wait for the website owner to do it for you.
Google hasn't yet provided a way for developers to create plugins for Chrome because doing so would open up a whole can of worms as far as security goes. Greasemonkey support is an interesting addition because developers can now essentially make a plugin that works for specific websites rather than allowing global "browser-level" plugins.
Of course, Google will one day have to allow the development of global plugins, but this is an important first step in the right direction.
[via Google Operating System]