Everything but "the rolling capo" Spaw. By the time it came out I was married, and Heather doesn't allow me to buy EVERYTHING that interests me.
The Scruggs-Reuben (if you've looked at Frank Ford's page) has morphed into the Dunlop "C" clamp.
The most important bit of information there is "put it verrrry close to the fret if you want to stay in tune. Most don't....and hence go sharp when they're capoed.