Any Windows user should know that almost any system element can be changed or modified. The Start menu button is no exception. If you want to give it a more personal and different touch, and stop calling it "Start" then take a look at this: Start Button Renamer.
Start Button Renamer works to change the text of this button. How? very simply: you just write the new text you want, and right click. The change is instant.
Start Button Renamer is a completely free application, and takes up very little space: less than half a megabyte.