I carry what I call a "green monster" - it is one of those one piece all-outlet plugs that you can find in an international airport. Mine purports to be Fuji, but I am sure that is just the BAA branding.

The nice thing is that if you use items with transformers (laptop) you never have to worry about the local power specifications.

One thing I also do is keep a "back end" cord for my laptop - the cord that plugs from the transformer into the wall - with a collegue in the countries I visit a lot. That way I can just plug directly in while at the office. You can get these cords at Radio Shack (UK) or almost any computer store in other countries. Usually a few dollars - very handy.