MacZot is offering Inventive's iClip as a free download today. It's version 3.7 and isn't a universal binary but version 4.0 is about to ship and the company has long offered free upgrades, so grab it now and watch for version 4.0 to ship. I'm not personally a user of multiple clipboards, but I suppose it couldn't hurt to give this a whirl. Who doesn't like free stuff.
Thanks Jonathan for the tip.