So here it is, a beta release of Clippings Editor -- a standalone utility that makes creating, viewing and editing Clippings datasource files easy.
» Download: Clippings Editor beta for Windows (6.9 MB; English (United States))
WARNING: This beta release is being made available for testing, and should only be installed if you are willing to tolerate a few bugs. If that doesn't sound like you, you should wait for the official release, which should happen at the same time as the official release of Clippings 3.0.
Click on the above download link and save the zip file to a desired location on your system, then unzip it to a folder of your choice. There is no setup program to run.
To uninstall it, simply delete the folder where the zip file was unzipped to.
Sorry, Clippings Editor is currently available for Windows only. This utility will be available for other systems (Linux, Mac OS) in the near future.
Starting Clippings Editor
To run Clippings Editor, locate the folder where it was installed to, then double-click on the file
To simplify things, you may want to create a shortcut on the Start menu or the Desktop to point to the executable.
Things You Should Know About
If creating a new Clippings datasource file, you must give it a file name and desired folder location before you can begin editing it.
The datasource file is automatically saved when exiting the application. The Save command in the File menu is available if you wish to save the currently-open file at any time.
The Save As command doesn't work if saving to a different folder. This is a known bug.
Clippings Editor can only edit a single file at a time (this is an SDI application). For now, if you want to edit two or more files simultaneously, simply run another instance of Clippings Editor.
Clippings Editor doesn't natively handle the old Clippings 1.x series format files. Clippings 1.x files can be opened, but a new Clippings file must be created to edit it. Also, Clippings Editor cannot save a file in Clippings 1.x format -- use the Export command on the File menu to export to Clippings 1.x format.
Do not use Clippings Editor to modify the Clippings datasource file in the user's Firefox or Thunderbird profile folder (or the user's home directory if the common Clippings datasource is enabled). Doing so may result in data corruption. Instead, invoke Clippings Manager from the host application and export the Clippings data using Options → Export. You can then edit the exported file using Clippings Editor.
And Finally... Some Fun Trivia
Clippings Editor is a standalone application that is based on Mozilla's XULRunner platform. The astute reader may notice in the above screen shot that Clippings Editor's user interface is remarkably similar to the Clippings Manager UI from Clippings (the extension for Firefox and Thunderbird) because both windows share the same code -- except for several modifications, e.g. removal of integration with Firefox and Thunderbird, new menu bar, and minor changes to the toolbar.