Clipboarder lets you save data and retrieve data in a quick and dirty way.
I use it a lot when I am doing prototyping.
It's basically just a wrapper around the java serialization API.

Usage:

// save any serializable object
List<Widgets> widgets = getListFromDb();
Clipboarder.put(widget, "widgets_version12");

// retrieve the object in another program
List<Widgets> widgets = (List<Widgets>) Clipboarder.get("widgets_version12");