We dropped of our first (and so far only) TB 'Clever Clog' in California - 5463.5mi from home - in August '09 on our (so far) one and only visit to the USA.
It has never moved!
There was a log entry five days after we'd dropped it off that read 'Took a keychain that refused to fit back in the cache'. We fear that was our little clog. Noooooo! We have its mate (this one is a red clog) that we might set free in Scotland this Easter but it's looking unlikely that the pair of Clever Clogs will ever meet up again.