If anyone else is interested, I've published the plugin on CodeCanyon.net. A quick summary of what it does:
- Automatically rename your media files and attachments as you upload them to WordPress.
- Choose between renaming images only or renaming all uploaded files.
- Add your blog name or some other text to all your uploaded file names.
- You can choose to automatically set the attachment title attribute to match the new file name.
Unfortunately the board doesn't allow me to post the link to download the file. So if you're interested, please go to CodeCanyon.net and search for "Easy Upload Renamer for WordPress"!
-Enrique