Yeah.
Beetlemania
because it exploits (a little) a concept I love in racing games: exploration, just like in some real competitions like Paris-Dakar, you need to find your path into the map, and not simply follow the road. Without this I usaually never touch a racing game other than Mario Kart. Nothe that, Pokémon Dash on DS was too a little into the same concept. I need more games like this.
Blast Corps
Not sure it is "not well known" but once again, very unique kind of game. Too bad it never get a sequel.
Snobow Kids
Mario Kart, by Atlus, with snowboard instead of karts. It is not Mario Kart but it is pretty fun, and have some nice ideas and fun moments, like at the end of the "lap", returning at the top of the course. Never played Snobow 2 or Snobow DS (i think there is one isn't it?) but Snobow 2 seemed to improve the formula a bit.
Typically I want a digital sequel here, on 3DS, could be fun with local multiplayer on the go but I'm not sure I will buy it other way.