Converting to Drupal

I am trying to convert over from Joomla!. I have not been able to find a polls module. The site that I am converting liked having polls. Is there one available? I did not see anything like this browing through the Modules.

1) Is it possible to export data from livelink opentext (http://livelink.com/) to import it in drupal?
-> using http://www.drupal.it/project/migration ??

(extended question .. no priority)
2) Is it to exchange data between livelink opentext and drupal?
-> so can i export the data from drupal to livelink opentext

Ok, I am manually putting my existing site's pages into drupal as page nodes. this seems to be working. I can see the html in each node. That is working out ok. What I need advice with is the linking of nodes to each other, with initial content in different directories. For example:

oldindex.php links to file1.php in the same directory and different-directory/file2.php

I'm having some issues converting my phpNuke site to Drupal. I've narrowed the amount of porting over to Drupal I want to keep to just two nuke portions. The Users and the Forums. But if need be, I can just convert the nukeBB to a PHPbb forum and link it in Drupal (but that is not the preferred route). I've got a machine at home that I'm doing most of my testing of Drupal on, and then working the same thing on the FQDN machine. Right now i've got my nuke_users database imported into the drupal database on my home machine. Here's what's happening when I try to import user database information from nuke->drupal:

mysql> INSERT INTO users (uid, name, pass, mail, signature, timezone, language, picture)
    -> SELECT user_id, name, user_password, user_email, user_sig, user_timezone, user_lang, user_avatar
    -> FROM nuke_users; 
ERROR 1062: Duplicate entry '' for key 2

This is my highest priority issue drawing the line between converting to Drupal and sticking it out with PHPnuke.

My second priority is to bring in allllll the forum activity to Drupal's forums, or just find a way to put all my forum stuff into PHPbb and load it as some kind of module in Drupal. So I guess I'm asking what my options are to bring my old forum content to my new CMS.

I'm absoluetly loving drupal so far. Making: http://www.daltongamers.net/ turn into my drupal sandbox: http://www.daltongamers.net/drupal/ so far is just being a hassle.

Is there a script out there to convert a phpNUKE theme to a theme that one of drupals theme engines can run? If not are there any hints or hacks anyone can suggest?

I'd like to read some success stories on migration to drupal, i am aparticularly interested in those who migrated from Postnuke 0.75

Please include:

reason for migration?
method: manual or script?
which tables were u able to move? users? articles/stories? topics? themes (how did the theme adapt to new environment)?
Any problems encountered with respect to search engine, loss of data etc...?

Thank you in advance