@brian Hatano:
I found that WP 3.0 changed the file wp-admin.php to ms-admin.php. I changed those references and a couple of incorrect directory references, and got the plugin to work!
Install the plugin from the admin->plugin. Make sure it’s deactivated and edit it. Delete the current code and copy and paste this code in. Click the Update button and then activate the plugin.
[Mod Note: Code segment removed. If you want to post large blocks of code, please use a pastebin (Alternate URL). (I realise there is another code segment about, but that’s months’ old now, so missed the boat on that one.]