Table Seatings??

There is a utility on the site under 'my Wedding'
.

You can input your guest list and then assign them to tables.

I read a post where a bride drew out the table layout and used mini post-its to layout the seating arragements. It sounds like a great idea to me! You can move people around easily until you have the seating down

If you have a registry with Bed Bath and Beyond - use their wedding planning toolkit - it's amazing!!!
If not, use theknot.com