Got my new Canon 5D Mark II camera, and took some pictures at a party in a dark restaurant.
ISO 6400, F/4.0, at a mix of 1/10s, 1/20s, & 1/30s, handheld, 105mm except the wide shot, 24mm. Lenses with Image Stabilization are a good thing.
The real reason people hold birthday parties:
Never leave out the party organier: