Compacts have small sensors, this means they use short focal lengths (hence the equivilent bit in the marketing - equivilent to the result given by a 35mm film camera). Also the f-numbers on your camera are equivilent too. So the aperture is smaller then you might realise.
Short focal lengths and wide apertures give large depth of field.
Therefore, harder to get blurry backgrounds on compacts.
Other factors play a part but for compacts this is the biggy.
See [link=http://www.megapixel.net/html/articles/article-dof.php">here or
#5046638, By Jos very newbie question
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