Back when the old Kickstarter extension was used, I found it really easy to extend TYPO3 by adding fields to the tables. With the new way that TYPO3 works, I'm not as familiar with the procedure for extending tables.

I was looking for a way to add a simple checkbox field to the pages table and I came across a very thorough tutorial on the subject, complete with a downloadable extension.

This tutorial is available in Deutch and in English from http://www.sklein-medien.de

You'll see all of the code that is used to extend the pages table of TYPO3 with a checkbox field and with a text field.