None in particular, most of the games I now own I didn't know about until after buying the system. It's a Nintendo handheld though, I had no worries there'd be good games. There are always good games on Nintendo systems, even if Nintendo has to put them all out themselves!
Xbox Live Gamertag: Donmilliken 3DS Friend Code: 1950-8212-1350
That first year had me playing a whole lot of Street Fighter IV... and nothing else 3DS specific until Ocarina of Time... which lasted me about four hours until I just couldn't bring myself to play any more. So the Street Fighter until Mario 3D Land and Kid Icarus.
At least I enjoy Street Fighter, and as the only modern portable iteration, it is fair.