Interesting question that really got me thinking. I have more cameras than I can use -- guess many of you know how that happens -- but after pondering long and hard I decided I would take an Olympus Stylus Epic (MJU outside the USA).
My reasons are:
1. Small - no need for a bag.
2. Weatherproof.
3. Superb, fast-tish lens.
4. Auto focus.
5. Spot metering.
6. Multiple flash modes
7. Great for street shooting and hip-shooting.
8. No-one thinks you're a serious photographer which is ironic because one of my best-selling news pics was taken with an Epic after I had packed away the more serious Nikons.
9. Reasonably wide angle lens.
10. Battery that seems to last for ever.
The fact that it uses a battery may be considered a disadvantage but then I figure, because I can stick the camera in a shirt pocket I'll have plenty of space for two spare batteries (that I reckon will give me about a year's shooting) as well as heaps of film.
No laptops, card readers, power packs. The more I think about it the more I like the Epic idea!