Since Liechtenstein, like Switzerland, is in Schengen (despite not being in the EU) it doesn't really have a border to get one's passport stamped at. You can get your passport stamped in the tourist info center (I think it costs 3chf) but I didn't bother. As it happens my passport has been to about 8 countries and has no stamps in because UK citizens don't get stamped entering Schengen (though I think they will if you ask) and there are almost no border checks within Schengen - I would say there are none but I think they do pop up occasionally.

San Marino is off for now on account of being a pig to get to from Florence (at least by public transport). So it'll be a nice simple trip to Italy this Autumn and then some crazy route to the FT Do in Nuremberg next year... Something like LHR-Sarajevo, Mostar, Zagreb, maybe Ljubljana. And I might get the train home via Luxembourg. How are you guys getting to Andorra?