I personly REALLY liked Elebits (or Eledees n UK). AThe storyline and voice/acting was very cheesy, but the controls were great and it was a very fun game. Plus you have the Edit Mode, which is VERY fun when you learn how to place objects.
Other than that I suggest Super Mario Galaxy when it comes out.
And I'm pretty sure that Mario Party 8 only uses the Wiimote since I saw a video off a screen at Best Buy and the people were using just a Wiimote.