One of the cooler things I discovered in an airport store several months back was the Monster Cable Outlets To Go. It's a 4 outlet power Strip that provides sufficient room to actually use all four outlets, even with the large power bricks. When the power strip is plugged into the wall, the plug glows blue to let you know it's plugged in.

When you're done, the power cord wraps around the outlets and plugs into one the plugs, creating a small, contact, portable source of outlets. Fits nicely into my bag, and seems like an absolute steal at $19.99.