You'll be seeing a request to update iTunes here soon as it just came out this morning. I'm running through my automated tests and such to make sure iTunesDSM still works with iTunes 9.0.3. I'll update the blog later when I know more.
UPDATE - It appears everything is OK with iTunesDSM and iTunes 9.03. If you come across something that doesn't seem to work let me know through the support forum, email or as a comment.