listing users in Plone

[Somesh]

Hi,

1.I have installed and running a plone Intranet site,
I have registerd users on it. I want to get list of all registerd users
on a page. how I should move towards getting it / scripting it in my
index_html page ?
I am just a frontend user of plone.

2.How to start creating small database driven pages programming on
plone ?
need too newbie tute :), 

PS : I have good hand on Python

- Somesh