My script is simple, it makes some font and color changes to a few websites that I view regularly to make them more legible (IMHO). I should bundle it into an extension some day…

Anyway, it took a bit of research to figure out what happened. Look here on the Google Chrome blog:

[r33013] Disable –enable-user-scripts. (Issue: 27520)
NOTE: You can now install user scripts by navigating to them. You will have to reinstall your current scripts (they aren’t migrated).

– http://googlechromereleases.blogspot.com/2009/12/dev-channel-has-been-updated-to-4.html

So, scripts are still supported, but I have to install it again. I didn’t quite understand “navigating to them” meant, but it actually means exactly what it says. In the address bar browse the file system, e.g. go to here:
C:\Users\%username%\AppData\Local\Google\Chrome\User Data\Default\User Scripts

Then double click on your .JS file, and a little extension installation prompt pops up. It’s pretty cool actually.

Hmm… now that Google Chrome regular version supports extensions, I might be able to take myself off the dev channel.