Right now, the plan is to rip everything I intend to show to the 'puter, with the added ability to play DVDs on the laptop as well. Of course, if someone brought along their portable DVD player, we'd have redundancy, and that never ever hurts.
I have a set of Virgin Boomtube speakers which, from the description of them on the 'net before purchase seemed the perfect adjunct to the computer, to ensure all could hear, but in reality they fall something short. I am evaluating options for the noisemaking portion of our show, consistent with weight, balance and budget.
Suggestions, as always, are welcomed!