Just to clarify for those who aren't aware:
Support ending in 2015 will be no more new versions of integrated software such as Internet Explorer or Windows Media Player along with new features and improvements to stability or performance. Security holes will still be patched until 2020.
What does this mean? Even though Windows itself will still receive security updates Internet Explorer won't so using an alternative browser such as Firefox is highly recommended. Other than that your system should run exactly as it is now, you simply won't get any additions to the system and there will be no changes of any kind, including for security, to bundled software such as IE or WMP. If it isn't strictly speaking a direct part of Windows, even if it is an inseparable part of Windows, it won't get anything at all from that point on.
Think of it as being like a car manufacturer saying they'll only maintain the chassis of cars they produced, and won't have anything to do with any other part such as wheels or windscreen even if they're the same ones the car was bought with.
-----
To live by honour and to honour life, these are our greatest strengths and our best hopes.