I was recently working on a custom Drupal 6.x module that needs to create a custom content type with fields upon installation. I did quite a bit of hunting for how best to do this. There are a few different approaches, including using the Features module, or having my module do all the node and db handling, etc. I decided to use the export and import features of CCK, and it's very easy to do. Here is a link to the handbook page at DO that explains how to do it.
I had my ear pierced today. Ow! All right, I concede that on a scale of one-to-ten, the pain measured only two, two-point-five, but that moment when the burly employee in the Claire’s smock assaulted my earlobe with a nail gun, it did hurt.