The Gorillapod is inexpensive (typically about $20), light, and takes up very little space in your travel bag. It is easy to use and versatile.
It greatly extends the places where you can take pictures of yourself (or of other things where you need the extra stability of a tripod).
It is a great stocking stuffer/gift for friends, and equally good as something for yourself too.
Please click to see our complete review of the Joby Gorillapod for a more complete discussion of what it is, what it does, and whether you should buy one or not.