I just got around to making some final commits and packaging two new versions of the TableField module. The D6 version backports the "import from CSV" functionality. The import was the most requested feature, so there ya go! You can now import any valid CSV file to any table. The D7 version adds a super convenient rebuild function using the #ajax features of the Forms API.
For those of you who haven't tried it, the TableField module lets you add tables to your nodes with a convenient input widget. In Drupal 7, you can add tables to any entity. Any help testing the new modules would be greatly appreciated!