Hasn't it bothered you to be stuck with Amazon when making e-book purchases for your Kindle reader? Well, our famed reverse-engineer friend
igorsk wrote his own application ("Mobipocket PID calculator for Amazon Kindle") to generate a valid Mobipocket PID from your Kindle's serial number. You use this PID to make your Mobipocket purchases; afterwards, you use another tiny application ("The Kindleizer") to convert the purchased Mobipocket e-books into a format that the Kindle would accept.
No question, this development will delight all Kindle customers but perhaps provide no small amount of frustration to the good folks over at Amazon.
You can download the tools (written in Python) over here:
link removed on Amazon's request