QUOTE
If your host offers PHP, it's as simple as changing your output file extensions [for main index, archives, etc.], rebuilding, and deleting your index.html page so that your server defaults to index.php.
Once that's done, you're done, unless you also want to delete the old .html files (in your archives folder for instance) which will duplicate newer files with the same content and the .php extension. If you do that, you might want to consider creating a custom 404 page to explain what's going on to those who follow broken links in, and give them a hint as to what to do next.
That's it? Just go through and change all the output files to .php and then rebuild?
It seems too easy... :0
Also, since all my MT links are generate dynamically I shouldn't have to worry about the 404 page, unless someone has something bookmarked right?
Maybe I'll create another blog that will be my guinea pig...