Any laptop with a small amount of shared memory is likely to have problems with milkdrop. There are a couple ways you could go:
1. 'Desktop replacement' laptop. These things run hot and chew up alot of juice, but they basically use desktop components, so you get all your usual desktop performance. The downside is that you really need to have them plugged into a wall, and they only count as a laptop if you're interested in sporting 2nd degree burns on your thighs.
2. A more mobile laptop with a proper graphics subsystem. They do exist, though I can't think of any in particular off the top of my head. They're usually a top-of-the-range model anyway. Be on the lookout for dedicated video ram. The downside is that it's likely to be pretty pricey.
3. A small for factor desktop. A shuttle, or similar, can take standard components (even components you already own), and crams them into something the size of a shoebox. Couple this with an LCD panel and a backpack (SFF case makers usually sell backpacks made to suit), and you can carry your entire rig on your back. Simple, easy to move, and looks good at home or in a club. No real downsides, unless you have your heart set on a laptop.
Eighty-three percent of all statistical quotes are made up on the spot.