I wanted to share an article I read today on projectwedding.com about an easy way to track your RSVP's.
Number your guest list and write the corresponding number (with a UV pen) on the RSVP cards of your invites/or save the date cards. That way if someone forgets to put their name on RSVP you will know exactly who it's from ( they won't be able to see it).
I think this is a brilliant idea, especially if you've invited lots of guests.
You can get the pens on dirt cheap on Amazon and they come with the UV light on the lid.