I run dozens of blogs for a newspaper company and after finding out about WPMU I had to swap over. I'm extremely excited about it and am planning to use it for all of our blogs from here on out.
I ran into one problem, however, when importing blogs that were running the Arthemia theme. The posts, comments and attachments all imported fine, but it seems that the following line is still calling to the old attachment path structure.
<?php $values = get_post_custom_values("Image"); echo $values; ?>
Is there any way to correct this without using mod_rewrite? The call to the thumbnail generator (timthumb.php) is fine, but the path to the images is still WP-style. What do I have to change to make it match the new WPMU structure?
Also, the images in the posts themselves still refer to the old blog installs. It isn't the end of the world. I could leave the old folders there, but why would Wordpress populate the image folders in the blogs.dir folder if it wasn't going to use them in the posts? Is there some plugin or script that will correct this for all posts on a blog?