Hello, all! I have published a free Mac app designed to ease the process of converting MobiPocket DRM'd e-books for use on the Kindle. This tool uses the scripts developed by igorsk, but shouldn't have any dependencies or require any command-line work - just drag and drop!
Please check out the Google Code project page for more info:
I've only tested this on OS X 10.5, so any reports of compatibility with other OS's would be appreciated. Let me know if you have any other thoughts!