The nightly builds of Google Chrome's open-source foundation, Chromium, includes a feature that might mean great things for Greasemonkey fans. Click on a user script file, such as at UserScripts.org, and Chromium asks to install it as a working extension.
Judging from the developers' discussions at the Chromium wiki, Greasemonkey, or at least some kind of user script support beyond the current, very geeky installation method has been a hot topic. The latest builds tackle user script support by re-mapping them into extensions, automatically activated at their relevant sites. You can give it a test by installing the latest Chromium build in Windows. We'll assume this feature will make its way very soon to those keeping updated on Chromium builds for Mac and Linux.
Before you get too amped though, it must be said that support is still rudimentary. Scripts that mostly replace one thing on a page with another seem to work fine, but those that pull off custom themes and page manipulations are touch and go. In other words, the more Greasemonkey-specific functions appear in a script, the less likely it is to work in Chromium. That said, it's reassuring to see some of the great Grease realm opened up to the up-and-coming browser.