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Joined: Jul 2005
First, try the HP12c platinum solutions book, available free in PDF form from HP's website. Find it here: http://h10032.www1.hp.com/ctg/Manual/c00367123.pdf
Second, there are a few games listed in the forum here for the 12cp. Seach for listings from Tony.
Third, there are quite a few useful programs for the HP12c platinum found in the back issues of Datafile, the publication of the HPCC club. Some of these were written by a museum contributor Valentin and by the previously mentioned Tony.
Otherwise, I'm not aware of a site dedicated to the HP12c platinum. But, perhaps that is a good idea. :-)