Download here, or wait for Firefox 2's cool new extension autoupdater to prompt you.
The main changes from 0.6.5 are:
- Firefox 2.0 support
- New, less crappy script installation UI
- Spanish localization
When you click on a user script now, it pops up an installation dialog that shows the title, description, and pages the script will be included on. If you want to see the source code, you can still do that by clicking "View Script Source" in the install dialog or in the user script's context menu.