Thanks useful information: 
The pole to the left is relatively in focus, but that is probably not because you used multipoint focus, but because it is approximately the same distance from you as the subject you focused on (the young girl). It MAY be because of multipoint focus (one reason I don't use it often, because it rarely picks the part of the scene that I want it to), but it's more likely the above.
As rick said, there's heaps of information on Depth of Field in the tutorials and library that will help you understand how to get the blurry background that everyone likes. You're on the right track with putting it down to aperture, but taking a bit of time to read some of the stuff there will help even more to put it all into perspective.
Then just start putting up some photos for people to give advice on, and you'll be amazed how fast it all starts to come together.
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