An interesting observation in that apparently if you have URL text data in your clipboard buffer, and you paste into Vista’s Windows Calculator (calc.exe) it pastes as pi?
If I copy the text "http://thisisnotpi.com" and paste it into calc.exe you get pi:
If you have "This is Not Pi" in your buffer and paste it in, you get "Invalid input for function":
Useless oddity, but just an accidental mis-pasting of what I thought was last in the buffer

Interesting. I played with this, and apparently the letter "p" is a shortcut for pi. You can either paste a string with "p" in it, or type "p" on the keyboard, and you get pi.
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