I'm currently test driving the DVX100 -

the 24p images are amazingingly rich; indoors,
that is - when i can control lights, filtering, temperature, etc.

however, when I shoot out in sunlight, the richness is gone and it starts to look painfully
video-esque again

any tips on how to preserve that nice film look
when dealing with LOTS of outdoor light?

Basically, control the outdoor light to the extent possible. This will generally mean using those ND filters and perhaps adding an additional ND to the lens under extremely bright conditions. Next, control that iris.

In general, it's best to avoid shooting in extremely bright midday sunlight. It's harsh and hard to manage for any video camera. Early morning and later afternoon are far better shooting times if possible.

In addition to Ken's suggestions, experiment with master ped settings and chroma levels in the scene file settings.

Also, underexpose highlights in cinegamma mode by 1-2 stops, you can reclaim the shadow detail with appropriate post tools

Ahh, and if you can't avoid the bright midday sun a good polarizing filter may greatly help eliminate veiling glare and put some saturation back into your colors.