Trying to copy the layout in admin/content/node for my own form module.

I'm new to drupal. I've managed to create this module which grabs db data and displays it. But it just comes out like a blob of data, not in nice zebra-ed rows and columns. I've even tried a recursive grep at the root of my Drupal dir for the following Header text (which sticks to the top as the user scrolls vertically in admin/content/node) and this text can't be found anywhere!

Title Type Author Status Operations

i don't see that I'm doing anything different than what's in node.admin.inc ( which generates admin/content/node ). I thought there was some default style functionality that is supposed to kick in. Is there a quick and easy way to display data rows?

Thanks.