I'm looking for something that can take the current file and return an md5/sha1/base64 hash.
⌥⌘R - "Text > Filter Through Command..." 1. Set "Input" to "Document" (the default, iirc) 2. Set "Output" as desired (e.g., "Show as HTML" creates a popup window) 3. Enter "md5" (or executable of choice) in the command line. 4. Execute!
Hope this helps, Daniel