Due to the nature of my work, I need to move a lot of wordpress installations from one webhost to another.
Since it is quite time consuming to manually copy files via FTP and then export/import databases with
phpMyAdmin or mysqldump (and I am not even mentioning link conversion after migration),
I created Wordpress mover script.
Another script, Wordpress siteurl changer, will help you
to fix the siteurl and home parameters in the wp-options mysql table, even if your blog is not working
properly (redirecting to 404 errors, etc).
Feel free to drop me a line in case you need any help via the Feedback menu.