This idea was suggested by a customer in the Confluence Community space.
It would be cool if the user could choose which spaces to include in the daily report email from Confluence. For example if I decided that the content in HR was of interest to me, I should be able to optionally add that space to the list of spaces that are of interest to me, so that they are included in the digest and recently updated page (but not being watched, b/c I don't need so many immediate emails).
In summary you should be able to opt for a daily email report which only includes your favourite spaces.
I understand that this is already possible with the RSS feed builder but some people just prefer email.