well, Poser 5 has a menu "Python Scrips" which contains "Pro Samples", "Geom. Mods", "Utility Functs", "Sample Callbacks", "Render I/O", "Material Mods", "Print Info", two empty fields and "Clear Buttons". At least I know what I can use the empty fields for, like adding an entry for MetaForms, but what are all the other things good for? Thanks.

The sample scripts aren't terribly useful. I've been writing and using Python in Poser for two years, and I've never used any of them except as examples of tricky bits of code. The initial layout is meant to illustrate how you can set up sub-menus. Some people find this useful. To begin with, it's easiest to just eliminate the original stuff and add your own favorites to the main list. For a quick guide to editing the MainButtons.py file, which is the layout for this menu, go to ockhamsbungalow.com/Python and click on the first item.