CCK Table Field
This module adds a CCK table field type that lets you add a table display to any content type without having to manually enter HTML. It currently parses text data to form the header and row content, but the goal is to accomplish the data entry using a custom form widget. The output is generated by the theme system, so you don't have to worry about forming valid HTML or adding all those little classes yourself.
There is currently no validation to ensure you have entered an equal number of cells in all the lines. The plan is to not put a whole lot of time into developing the textarea based data entry but into developing the form based entry instead. When this is achieved, I will consider the 1.0 version of this module ready to go. I'll happily accept patches toward this effort. : )
The module currently ignores the multiple value option when adding the field to a content type. The goal is to support multiple tables, and when that occurs, to append a delta value to the custom CSS ID you can assign to tables. I'll happily accept patches toward this effort, too!