RSS Digest is a plugin that creates daily digests from an RSS or Atom feed that you specify.
RSS Digest supports all major versions of RSS and Atom, namely
RSS Digest uses the 'fetch_feed' library, which is new to WordPress 2.8. As a result, RSS Digest currently only works with WordPress 2.8 or later.
Yes, but I hope you won't :-)
Whether the attribution text appears is controlled by the "Give credit to RSS Digest" setting on the configuration page.
Perhaps you'd consider leaving it on for a limited time before removing just to help us get the word out?
Possibly. Leave a comment on the plugin's homepage with your feature request and we'll see what we can do.