I've found that most electrical chargers or whatnot usually auto-adjust for voltage. Except for my DS

- which sucked until I got one that charges it through USB. When I travel, I usually have like 6 different chargers - Laptop, DSLR, P+S, DS, MP3 Player, Phone...
I'll usually get one plug adaptor that goes from *insert UK/Euro/etc* to a regular US plug, then I got a 3-way plug from a dollar store here, so I could plug in a few more things.