A portable surge protector is a great accessory for any notebook. I bought myself a
Tripplite Traveler from Dell Accessories (sale + free ship).
It's got some nice features
+ 1050 Joule rating
+ wall plug retracts into unit, making it more compact
+ 2 outlets
+ telephone line splitter
+ ground AND protected lights (most 1 socket ones seem to have just 1 light)
Build quality is excellent. I had a 1 socket Tripplite surge protector made of cheap, creaky plastic. In contrast, this one feels very solid.