83 games total. 73 Color and 10 B&W (including Samurai Shodown!).
I certainly second what other people have said about it being silly and pointless to collect every one of them, though. No more pointless than collecting all 39 Euopean releases, though, and that seems to be a big deal to a lot of people here.
Just get the good games and enjoy them. Period.
But if you're still curious, here's a link to <a href="http://www.rattlebrain.com/~opaopa/pokefaq.txt" target="_blank">SWEATER FISH DELUXE'S PULSE-POUNDING DEATH-DEFYING EXHAUSTIVE NEO GEO POCKET SOFTWARE FAQ</a>, which is still incomplete, but does list every game along with (ir)relevant info.