I can't believe I didn't think about the Cursa a Pèl having its own thread before! It totally deserves it! I'm Catalan and I've run in the Cursa a Pèl. It's awesome! It takes place in July in the village of Premià de Mar (Catalonia), about half an hour from Barcelona. It's a great moment of the year to run naked, and it ends in the beach, where all the participants take a bath and there are free music concerts all night.
Who knows, maybe thanks to OCC the Cursa a Pèl will be even bigger, if tourists from other countries join the fun
I also searched the net for pics of the Cursa but google was not much help. The best (and basicly the only worthy) source I found for Cursa a Pèl pics is this blog:
catalunyaaflordepell.blogspot.com
They have pretty much all the material I've seen till now, including all of our friend RGN's masterpieces. But I'm sure there must be many more pics out there, as EVERYBODY (boys AND girls) was taking a lot of pics when I went there. So we'll have to keep searching!