http://ditto-cp.sourceforge.net/
Quoting:
Ditto is an extension to the standard windows clipboard. It saves each item placed on the clipboard allowing you access to any of those items at a later time. Ditto allows you to save any type of information that can be put on the clipboard, text, images, html, custom formats, ...Interesting features:
- Keep multiple computer's clipboards in sync (encrypted)
- It has a portable installer.
TBC: how does it stack against ARS Clip?