I know that this is a little off my usual topic, but I wanted to get a plug in for how great Jotform is as an RSVP tool for smaller events.  It allows you to build a form, automatically send the attendee a confirmation note, receive the info by email and, best of all, it aggregates all the RSVPs in a spreadsheet so you don’t have to copy and paste from the emails.  It’s frée up to a point and then their rates are fair for bigger needs.  Check them out at www.Jotform.com