Here's the solution.
Worked for me quite well. When he writes "run" the script he means that once you've upoaded the script to your main WordPress folder (probably public_html folder) you then type in you blog URL with /blogger-beta-import.php into your browser. The script then runs (it is the sweetest sight to behold)
I had to run mine twice to get all the posts (after the first run I deleted the posts that had already been imported)
Anyhow, it works fantastically.
* Please note Ady (the creator) says to delete the script immediately after running it for security reasons.
** Thank you Ady for creating this solution. Here's some info on Ady from his website:
This is the website of Ady Romantika (yes that's his real name, seriously). Ady spent more than 8 years as a PHP programmer, with a touch of C. He is passionate about Linux and is also a Linux System Administrator. He lives a hectic lifestyle and is now into security area working in an MNC in Cyberjaya.
Hates using the phone, loves email. Contact Ady via email at ady at romantika dot name and ask him anything. If he can, he'll help.