Since there may be several notes that you need to include in the e-mail body, then you probably want to either create a plug-in, javascript or other code to add the note Title and not Desription to a ntext type field on the Case form. then you could easily place the content in your e-mail that is generated when the Case is resolved.
Otherwise you can create a custom workflow that triggers when the case is resolved and loops through the notes to gather all the Note titles and descriptions and add them to the e-mail.
I don't have sample code for either of the above but you can look through the SDK for examples of how to build javascript and create other types of customization.
The easiest thing would be to have the client change their business process and create a ntext field for them to use for case updates that they want delivered in the e-mail. I don't know if that is a viable option.
Best Regards,
Donna
