I've been really surprised by the lack of any sort of listserv / mailing list creation and management modules in Drupal. We've been using mailman for a few years now and have grown tired maintaining it. We'd like to merge that functionality into Drupal so that the users only need to change their email addresses in one location. Since no one modules exists do handle the functionality of a listserv (as far as I can tell), I'd like to piece one together or just create my own.

Here's the basic functionality we need:

I just upgraded to Drupal 6 using Greggles video, but it didn't go as smoothly as his example did. The first reason for this is because apparently my host (or something on my end) has it so that if a folder is replaced, it deletes the contents before copying it over - meaning I lost all of my settings and modules. That's not a huge deal since I made a back up, but after running the update script I got a LOT of errors.

What webhosts do you use? What sort of load do you put on them? I've been using Angie Byron's blog at Lullabot for a base of what I'm looking for in a good host as well. In short:
* Runs Drupal.
* 50+ MySQL databases ... a must for setting up sandboxes.
* 50+ domains/subdomains ... I have something stupid like 30 domains.
* 50+ SVN repositories
* SSH access
* PHP 5
* Ruby on Rails
* Misc. other languages; java, c, c++, python, perl...