The Mail App on iOS 5 adds support for flagging emails, but I can't seem to find a way to actually put this feature to use.
Is there a way to search for flagged emails?
Is there a way to cleverly auto-filter flagged emails into a folder?
I know that using GMail as an IMAP server automatically duplicates flagged messages in the "Starred" folder - but if you are using another email service, is there any way to make flags useful on iOS?