One request for Gmail

Please give us a "Flag" or "Follow-up" option on our e-mails.I never thought I'd say this, but take a page our of the Windows Outlook book and let me flag my emails to follow up on later. I can't keep track of all of the e-mails that I receive in a day and often forget about many and in turn receive irate e-mails from people because I have a bad memory.