I love this picture!! However I have a question that I hope doesn't offend you for whatever reason! Did you edit this photo? because it looks awesome the way the yellow is so vibrant and clear while the background is blurred. Next, if you did edit it, what program do you use?
--If you didn't edit this I'm really sorry for assuming! also if you find it a stupid question, I never asked!
I shoot RAW, because I prefer to do the post-processing myself, as opposed to the automatic processing your camera performs on the image when you shoot JPEG (yes, every camera has a built-in automatic-processing program, so essentially EVERY digitally taken photo is processed, even if you did nothing to add to it).
Lightroom 4 and Photoshop CS5 are my programs of choice.
The blurred background has nothing to do with processing. It comes from the SHALLOW DOF (depth of field) - an outcome of using a large aperture of 2.5 on the lens, while shooting.
My processing mostly involves color correction and brightness/shadow corrections.
Hope that helps.