66 Cards +1 for commander, with approx. 40 playables and 26 lands, which has about the same ratio as 24 lands at 60. Mine is still a work in progress, I have yet to even out the colors as well as begin any major testing.

I personally believe a lot of the appeal of commander cube is the support for a large variety of archetypes and more niche synergies being available than a normal draft. Because a commander cube generally has both a higher ratio of multicolor cards as well as cards more narrow gameplans, it becomes important to have a larger pool of cards to build from. I have a 720 card cube, and with 8 people, 6 packs of 15 each uses the whole cube.

The thing that makes each draft so incredibly unique is when you have to draft the legends from the packs themselves. This way its nearly impossible for 3 people to draft the same color combination. This way you can reach constructed levels of edh after the draft, with crazy synergies going around. Everything else is standard rules.

http://www.cubetutor.com/draft/63923

If you want to give this cube a spin I've found 15/6/6 to be the most effective for the AI.