It's nice to know that a simple file can do so much!
I will, I promise, put up a tutorial on writing product type flypages. I still think they should be called something else such as product type extensions. But I believe mod goes some way to not needing them unless a special output is required such as the icons.
I'm glad you like it.
Just to add to this, I have a modification for csvimproved that allows product type data to be uploaded with the product data. At the moment it has to be done separately and xref have to be done manually. The mod allows the data to be uploaded in one hit. The only pre-requisites are the product type has to already exist and the product sku must be included.
This has been used successfully on a site with just over 1000 products and over 50 product type fields. A sample can be seen
hereIt's in Norwegian, the only standard tags are addtocart and product_desc. It uses my lightbox too.