Change a multiple value field to use divs instead of a table in node/add? I have the # of values set to 10, which I want to put in 2 columns of 5 each, but I don't know how to change the table structure to accomplish this, or perhaps preferably, just change it to use divs so I do it with css.
You can override theme_field_multiple_value_form(), e.g.

function MYTHEME_field_multiple_value_form($vars) {
  // Copy code from theme_field_multiple_value_form() and change as appropriate
}


It's not a short function, and you'll probably be reproducing a bunch of code, but it uses theme_table() directly so it can't be solved with a preprocess function.