Maintain permalinks when moving from Movable Type

Attention mod_rewrite gurus. I moved from Movable Type to WP recently and want to preserve permalinks.

Here’s my original URL in MT:
http://onlinedatingpost.com/archives/2005/12/20/vivox_the_next_big_thing_in_online_dating.php

Current URL in WP:
http://onlinedatingpost.com/archives/2005/12/vivox_the_next_big_thing_in_online_dating/

I need to remove the day portion from the middle of the url and strip the .php suffix from the end. I will use mod_rewrite and .htaccess to do this (Is there any other way?)

This is a good url to learn more about how to do this:
http://adamstiles.com/2005/10/painless_switch_from_typepad_to_wordpress/

However, the actual code for what I want to do in the .htaccess file eludes me.

Can someone put together the code I need to place into .htaccess? I’m sure many other people would like to know how to do this. Both url structures are as I understand it “out of the box” configurations.