I've been wondering about ways to migrate all of my old blog entries to Drupal. BlogFS looks like it might be a viable option if it works with Drupal. From the home page:
BlogFS is a FUSE filesystem allowing you to mount your WordPress blog on your local filesystem. It uses XML-RPC and the MetaWeblog API to communicate with WordPress. It might work on other MetaWeblog compatible weblogs, but it has only been tested with the single user edition of WordPress 1.5.