One of the ways you can extend the functionality of Google Chrome browser is through "'user scripts" as part of a Chrome extension. This is great, but what about all those great Greasemonkey scripts that have been available for a really long time? Seems strange that we need to reinvent the wheel doesn't it?
Well, I guess Google thought the same thing -- Greasemonkey scripts are really useful, and there are over 40,000 to choose from. It only makes sense for Google to officially support these scripts, since they are essentially exactly the same thing as what you can build with Google Chrome extensions.
Today Google announced official support for Greasemonkey scripts. That said, 15% to 25% of existing scripts available may not yet work with Chrome according to Aaron Boodman -- but Google is working hard to bring their implementation of user scripts closer to Greasemonkey to try and reduce that number.
If you want to see what kind of scripts are available, try going to userscripts.org -- installing them is a one-click process. These scripts are essentially converted to Google Chrome extensions, so managing them is exactly the same.
Extending Chrome has never been easier -- now there's even fewer reasons not to switch to Google Chrome from Firefox or Opera.