A quick tip for Caboodle, from the FAQ:

Normally when you drag a file into a Caboodle entry it copies it, allowing you to delete the original. But often you want to keep the original in place too, and want to avoid bloating Caboodle's data with large files (or folders).

The solution is to hold down the Control () key when dragging the file or folder to the Caboodle entry: the mouse pointer will change to include an alias symbol instead of the green plus. It will then make an alias (link) to the original. Then when you double-click on the file (or view it inline for images and PDFs), the original will open. Of course, in this case you shouldn't move or delete the original file.