As a follow up to my earlier post, I have a plan for how to assign tables. My parents are hosting my wedding, so the replies will go to them. But I think a good plan is to set up little containers or envelopes and mark them Table 1, Table 2, etc. Then as the replies start to come in, think about where each person should go - just off the top of your head, nothing has to be finalized yet.
Write their name on an index card and assign them to a table (by putting them in their respective container/envelope). Perhaps, write their name on the outside of the envelope so you can quickly see who else is at the table. When the reply date has arrived, you can lay out the index cards according to each table and see how they match up. You can make any necessary adjustments at the time. If you do it a little bit at a time, it will cut down on the size of your headache, hopefully.
PS Mom - I have a feeling you have figured out the comment thing. So come out, come out wherever you are! Chime in girl!