{today} in the subject line kind of works, but you can't have the 'Summarize Scheduled Emails' box checked. So, to put into perspective, if you have a saved search that is scheduled to run, and it has 10 results, and you have the Summarize Scheduled Emails box checked, the recipient(s) will receive one e-mail with the 10 results in the e-mail ( or attached if you choose to have results attached ). If you uncheck the Summarize Scheduled Emails box, and your search returns 10 results, it will send out 10 separate e-mails with one result per e-mail.